[pykdtree] 01/02: Imported Upstream version 0.2

Antonio Valentino a_valentino-guest at moszumanska.debian.org
Sat Jun 21 09:22:49 UTC 2014


This is an automated email from the git hooks/post-receive script.

a_valentino-guest pushed a commit to branch master
in repository pykdtree.

commit 53aefa02a289c5264a617a2cf73d35d3c4ec02d0
Author: Antonio Valentino <antonio.valentino at tiscali.it>
Date:   Sat Aug 10 16:41:37 2013 +0000

    Imported Upstream version 0.2
---
 MANIFEST.in                            |    1 +
 PKG-INFO                               |   16 +
 README                                 |    1 +
 pykdtree.egg-info/PKG-INFO             |   16 +
 pykdtree.egg-info/SOURCES.txt          |   13 +
 pykdtree.egg-info/dependency_links.txt |    1 +
 pykdtree.egg-info/requires.txt         |    1 +
 pykdtree.egg-info/top_level.txt        |    1 +
 pykdtree/__init__.py                   |    0
 pykdtree/_kdtree_core.c                | 1283 +++++
 pykdtree/kdtree.c                      | 8244 ++++++++++++++++++++++++++++++++
 pykdtree/test_tree.py                  |  272 ++
 setup.cfg                              |    8 +
 setup.py                               |   74 +
 14 files changed, 9931 insertions(+)

diff --git a/MANIFEST.in b/MANIFEST.in
new file mode 100644
index 0000000..4d2ad99
--- /dev/null
+++ b/MANIFEST.in
@@ -0,0 +1 @@
+exclude pykdtree/render_template.py
diff --git a/PKG-INFO b/PKG-INFO
new file mode 100644
index 0000000..1a9cad7
--- /dev/null
+++ b/PKG-INFO
@@ -0,0 +1,16 @@
+Metadata-Version: 1.1
+Name: pykdtree
+Version: 0.2
+Summary: Fast kd-tree implementation with OpenMP-enabled queries
+Home-page: UNKNOWN
+Author: Esben S. Nielsen
+Author-email: esn at dmi.dk
+License: UNKNOWN
+Description: UNKNOWN
+Platform: UNKNOWN
+Classifier: Development Status :: 4 - Beta
+Classifier: License :: OSI Approved :: GNU General Public License v3 (GPLv3)
+Classifier: Programming Language :: Python
+Classifier: Operating System :: OS Independent
+Classifier: Intended Audience :: Science/Research
+Classifier: Topic :: Scientific/Engineering
diff --git a/README b/README
new file mode 120000
index 0000000..92cacd2
--- /dev/null
+++ b/README
@@ -0,0 +1 @@
+README.rst
\ No newline at end of file
diff --git a/pykdtree.egg-info/PKG-INFO b/pykdtree.egg-info/PKG-INFO
new file mode 100644
index 0000000..1a9cad7
--- /dev/null
+++ b/pykdtree.egg-info/PKG-INFO
@@ -0,0 +1,16 @@
+Metadata-Version: 1.1
+Name: pykdtree
+Version: 0.2
+Summary: Fast kd-tree implementation with OpenMP-enabled queries
+Home-page: UNKNOWN
+Author: Esben S. Nielsen
+Author-email: esn at dmi.dk
+License: UNKNOWN
+Description: UNKNOWN
+Platform: UNKNOWN
+Classifier: Development Status :: 4 - Beta
+Classifier: License :: OSI Approved :: GNU General Public License v3 (GPLv3)
+Classifier: Programming Language :: Python
+Classifier: Operating System :: OS Independent
+Classifier: Intended Audience :: Science/Research
+Classifier: Topic :: Scientific/Engineering
diff --git a/pykdtree.egg-info/SOURCES.txt b/pykdtree.egg-info/SOURCES.txt
new file mode 100644
index 0000000..0dc7a13
--- /dev/null
+++ b/pykdtree.egg-info/SOURCES.txt
@@ -0,0 +1,13 @@
+MANIFEST.in
+README
+setup.cfg
+setup.py
+pykdtree/__init__.py
+pykdtree/_kdtree_core.c
+pykdtree/kdtree.c
+pykdtree/test_tree.py
+pykdtree.egg-info/PKG-INFO
+pykdtree.egg-info/SOURCES.txt
+pykdtree.egg-info/dependency_links.txt
+pykdtree.egg-info/requires.txt
+pykdtree.egg-info/top_level.txt
\ No newline at end of file
diff --git a/pykdtree.egg-info/dependency_links.txt b/pykdtree.egg-info/dependency_links.txt
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/pykdtree.egg-info/dependency_links.txt
@@ -0,0 +1 @@
+
diff --git a/pykdtree.egg-info/requires.txt b/pykdtree.egg-info/requires.txt
new file mode 100644
index 0000000..296d654
--- /dev/null
+++ b/pykdtree.egg-info/requires.txt
@@ -0,0 +1 @@
+numpy
\ No newline at end of file
diff --git a/pykdtree.egg-info/top_level.txt b/pykdtree.egg-info/top_level.txt
new file mode 100644
index 0000000..8ef49ab
--- /dev/null
+++ b/pykdtree.egg-info/top_level.txt
@@ -0,0 +1 @@
+pykdtree
diff --git a/pykdtree/__init__.py b/pykdtree/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/pykdtree/_kdtree_core.c b/pykdtree/_kdtree_core.c
new file mode 100644
index 0000000..a80449e
--- /dev/null
+++ b/pykdtree/_kdtree_core.c
@@ -0,0 +1,1283 @@
+/*
+pykdtree, Fast kd-tree implementation with OpenMP-enabled queries
+ 
+Copyright (C) 2013  Esben S. Nielsen
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/*
+This kd-tree implementation is based on the scipy.spatial.cKDTree by
+Anne M. Archibald and libANN by David M. Mount and Sunil Arya.
+*/
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <float.h>
+
+#define PA(i,d)			(pa[no_dims * pidx[i] + d])
+#define PASWAP(a,b) { uint32_t tmp = pidx[a]; pidx[a] = pidx[b]; pidx[b] = tmp; }
+
+
+typedef struct
+{
+    float cut_val;
+    int8_t cut_dim;
+    uint32_t start_idx;
+    uint32_t n;
+    float cut_bounds_lv;
+    float cut_bounds_hv;
+    struct Node_float *left_child;
+    struct Node_float *right_child;
+} Node_float;
+
+typedef struct
+{
+    float *bbox;
+    int8_t no_dims;
+    uint32_t *pidx;
+    struct Node_float *root; 
+} Tree_float;
+
+
+typedef struct
+{
+    double cut_val;
+    int8_t cut_dim;
+    uint32_t start_idx;
+    uint32_t n;
+    double cut_bounds_lv;
+    double cut_bounds_hv;
+    struct Node_double *left_child;
+    struct Node_double *right_child;
+} Node_double;
+
+typedef struct
+{
+    double *bbox;
+    int8_t no_dims;
+    uint32_t *pidx;
+    struct Node_double *root; 
+} Tree_double;
+
+
+
+void insert_point_float(uint32_t *closest_idx, float *closest_dist, uint32_t pidx, float cur_dist, uint32_t k);
+void get_bounding_box_float(float *pa, uint32_t *pidx, int8_t no_dims, uint32_t n, float *bbox);
+int partition_float(float *pa, uint32_t *pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, float *bbox, int8_t *cut_dim, 
+              float *cut_val, uint32_t *n_lo);
+Tree_float* construct_tree_float(float *pa, int8_t no_dims, uint32_t n, uint32_t bsp);
+Node_float* construct_subtree_float(float *pa, uint32_t *pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, uint32_t bsp, float *bbox);
+Node_float * create_node_float(uint32_t start_idx, uint32_t n, int is_leaf);
+void delete_subtree_float(Node_float *root);
+void delete_tree_float(Tree_float *tree);
+void print_tree_float(Node_float *root, int level);
+float calc_dist_float(float *point1_coord, float *point2_coord, int8_t no_dims);
+float get_cube_offset_float(int8_t dim, float *point_coord, float *bbox);
+float get_min_dist_float(float *point_coord, int8_t no_dims, float *bbox);
+void search_leaf_float(float *restrict pa, uint32_t *restrict pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, float *restrict point_coord, 
+                 uint32_t k, uint32_t *restrict closest_idx, float *restrict closest_dist);
+void search_splitnode_float(Node_float *root, float *pa, uint32_t *pidx, int8_t no_dims, float *point_coord, 
+                      float min_dist, uint32_t k, float distance_upper_bound, float eps_fac, uint32_t *  closest_idx, float *closest_dist);
+void search_tree_float(Tree_float *tree, float *pa, float *point_coords, 
+                 uint32_t num_points, uint32_t k,  float distance_upper_bound, 
+                 float eps, uint32_t *closest_idxs, float *closest_dists);
+
+
+void insert_point_double(uint32_t *closest_idx, double *closest_dist, uint32_t pidx, double cur_dist, uint32_t k);
+void get_bounding_box_double(double *pa, uint32_t *pidx, int8_t no_dims, uint32_t n, double *bbox);
+int partition_double(double *pa, uint32_t *pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, double *bbox, int8_t *cut_dim, 
+              double *cut_val, uint32_t *n_lo);
+Tree_double* construct_tree_double(double *pa, int8_t no_dims, uint32_t n, uint32_t bsp);
+Node_double* construct_subtree_double(double *pa, uint32_t *pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, uint32_t bsp, double *bbox);
+Node_double * create_node_double(uint32_t start_idx, uint32_t n, int is_leaf);
+void delete_subtree_double(Node_double *root);
+void delete_tree_double(Tree_double *tree);
+void print_tree_double(Node_double *root, int level);
+double calc_dist_double(double *point1_coord, double *point2_coord, int8_t no_dims);
+double get_cube_offset_double(int8_t dim, double *point_coord, double *bbox);
+double get_min_dist_double(double *point_coord, int8_t no_dims, double *bbox);
+void search_leaf_double(double *restrict pa, uint32_t *restrict pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, double *restrict point_coord, 
+                 uint32_t k, uint32_t *restrict closest_idx, double *restrict closest_dist);
+void search_splitnode_double(Node_double *root, double *pa, uint32_t *pidx, int8_t no_dims, double *point_coord, 
+                      double min_dist, uint32_t k, double distance_upper_bound, double eps_fac, uint32_t *  closest_idx, double *closest_dist);
+void search_tree_double(Tree_double *tree, double *pa, double *point_coords, 
+                 uint32_t num_points, uint32_t k,  double distance_upper_bound, 
+                 double eps, uint32_t *closest_idxs, double *closest_dists);
+
+
+
+/************************************************
+Insert point into priority queue
+Params:
+    closest_idx : index queue
+    closest_dist : distance queue
+    pidx : permutation index of data points
+    cur_dist : distance to point inserted
+    k : number of neighbours
+************************************************/
+void insert_point_float(uint32_t *closest_idx, float *closest_dist, uint32_t pidx, float cur_dist, uint32_t k)
+{
+    int i;
+    for (i = k - 1; i > 0; i--)
+    {
+        if (closest_dist[i - 1] > cur_dist)
+        {
+            closest_dist[i] = closest_dist[i - 1];
+            closest_idx[i] = closest_idx[i - 1];
+        }
+        else 
+        {
+            break;
+        }
+    }
+    closest_idx[i] = pidx;
+    closest_dist[i] = cur_dist;
+}
+
+/************************************************
+Get the bounding box of a set of points
+Params:
+    pa : data points
+    pidx : permutation index of data points
+    no_dims: number of dimensions
+    n : number of points
+    bbox : bounding box (return)
+************************************************/
+void get_bounding_box_float(float *pa, uint32_t *pidx, int8_t no_dims, uint32_t n, float *bbox)
+{
+    float cur;
+    int8_t bbox_idx;
+
+    /* Use first data point to initialize */
+    for (int8_t i = 0; i < no_dims; i++)
+    {
+        bbox[2 * i] = bbox[2 * i + 1] = PA(0, i);
+    }
+
+    /* Update using rest of data points */
+    for (uint32_t i = 1; i < n; i++)
+    {
+        for (int8_t j = 0; j < no_dims; j++)
+        {
+            bbox_idx = 2 * j;
+            cur = PA(i, j);
+            if (cur < bbox[bbox_idx])
+            {
+                bbox[bbox_idx] = cur;
+            }
+            else if (cur > bbox[bbox_idx + 1])
+            {
+                bbox[bbox_idx + 1] = cur;
+            }
+        }
+    }
+}
+
+/************************************************
+Partition a range of data points by manipulation the permutation index.
+The sliding midpoint rule is used for the partitioning.
+Params:
+    pa : data points
+    pidx : permutation index of data points
+    no_dims: number of dimensions
+    start_idx : index of first data point to use
+    n :  number of data points
+    bbox : bounding box of data points
+    cut_dim : dimension used for partition (return)
+    cut_val : value of cutting point (return)
+    n_lo : number of point below cutting plane (return)    
+************************************************/
+int partition_float(float *pa, uint32_t *pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, float *bbox, int8_t *cut_dim, float *cut_val, uint32_t *n_lo)
+{
+    int8_t dim = 0;
+    uint32_t p, q;
+    float size = 0, min_val, max_val, split, side_len, cur_val;
+    uint32_t end_idx = start_idx + n - 1;
+    
+    /* Find largest bounding box side */
+    for (int8_t i = 0; i < no_dims; i++)
+    {
+        side_len = bbox[2 * i + 1] - bbox[2 * i];
+        if (side_len > size)
+        {
+            dim = i;
+            size = side_len;
+        }
+    }
+    
+    min_val = bbox[2 * dim];
+    max_val = bbox[2 * dim + 1];
+    
+    /* Check for zero length or inconsistent */
+    if (min_val >= max_val)
+        return 1;
+    
+    /* Use middle for splitting */    
+    split = (min_val + max_val) / 2;
+    
+    /* Partition all data points around middle */
+    p = start_idx;
+    q = end_idx;
+    while (p <= q)
+    {
+        if (PA(p, dim) < split)
+        {
+            p++;
+        }
+        else if (PA(q, dim) >= split)
+        {
+            /* Guard for underflow */
+            if (q > 0) 
+            {
+                q--;
+            }
+            else
+            {
+                break; 
+            }   
+        }
+        else
+        {
+            PASWAP(p, q);
+            p++;
+            q--;    
+        } 
+    }
+
+    /* Check for empty splits */
+    if (p == start_idx)
+    {
+        /* No points less than split. 
+           Split at lowest point instead.
+           Minimum 1 point will be in lower box.
+        */
+        
+        uint32_t j = start_idx;
+        split = PA(j, dim);
+        for (uint32_t i = start_idx + 1; i <= end_idx; i++) 
+        {
+            /* Find lowest point */
+            cur_val = PA(i, dim); 
+            if (cur_val < split)
+            {
+                j = i;
+                split = cur_val;
+            }
+        }
+        PASWAP(j, start_idx);
+        p = start_idx + 1;
+    }
+    else if (p == end_idx + 1)
+    {
+        /* No points greater than split. 
+           Split at highest point instead.
+           Minimum 1 point will be in higher box.
+        */
+        
+        uint32_t j = end_idx;
+        split = PA(j, dim);
+        for (uint32_t i = start_idx; i < end_idx; i++)
+        {
+            /* Find highest point */
+            cur_val = PA(i, dim);
+            if (cur_val > split)
+            {
+                j = i;
+                split = cur_val;
+            }    
+        }
+        PASWAP(j, end_idx);
+        p = end_idx;    
+    }
+    
+    /* Set return values */
+    *cut_dim = dim;
+    *cut_val = split;
+    *n_lo = p - start_idx;
+    return 0;
+}
+
+/************************************************
+Construct a sub tree over a range of data points.
+Params:
+    pa : data points
+    pidx : permutation index of data points
+    no_dims: number of dimensions
+    start_idx : index of first data point to use
+    n :  number of data points
+    bsp : number of points per leaf
+    bbox : bounding box of set of data points
+************************************************/
+Node_float* construct_subtree_float(float *pa, uint32_t *pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, uint32_t bsp, float *bbox)
+{
+    /* Create new node */
+    int is_leaf = (n <= bsp);
+    Node_float *root = create_node_float(start_idx, n, is_leaf);
+    if (is_leaf)
+    {   
+        /* Make leaf node */
+        root->cut_dim = -1;     
+    }
+    else
+    {
+        /* Make split node */
+        int rval;
+        int8_t cut_dim;
+        uint32_t n_lo;
+        float  cut_val;
+        
+        /* Partition data set and set node info */
+        rval = partition_float(pa, pidx, no_dims, start_idx, n, bbox, &cut_dim, &cut_val, &n_lo);
+        if (rval == 1)
+        {
+            root->cut_dim = -1;
+            return root;         
+        }
+        root->cut_val = cut_val;
+        root->cut_dim = cut_dim; 
+        
+        /* Recurse on both subsets */
+        float lv = bbox[2 * cut_dim];
+        float hv = bbox[2 * cut_dim + 1];
+        
+        /* Set bounds for cut dimension */
+        root->cut_bounds_lv = lv;
+        root->cut_bounds_hv = hv;
+        
+        /* Update bounding box before call to lower subset and restore after */
+        bbox[2 * cut_dim + 1] = cut_val;
+        root->left_child = (struct Node_float *)construct_subtree_float(pa, pidx, no_dims, start_idx, n_lo, bsp, bbox); 
+        bbox[2 * cut_dim + 1] = hv;
+        
+        /* Update bounding box before call to higher subset and restore after */
+        bbox[2 * cut_dim] = cut_val;
+        root->right_child = (struct Node_float *)construct_subtree_float(pa, pidx, no_dims, start_idx + n_lo, n - n_lo, bsp, bbox); 
+        bbox[2 * cut_dim] = lv;   
+    }
+    return root;    
+}
+
+/************************************************
+Construct a tree over data points.
+Params:
+    pa : data points
+    no_dims: number of dimensions
+    n :  number of data points
+    bsp : number of points per leaf
+************************************************/
+Tree_float* construct_tree_float(float *pa, int8_t no_dims, uint32_t n, uint32_t bsp)
+{
+    Tree_float *tree = (Tree_float *)malloc(sizeof(Tree_float));
+    tree->no_dims = no_dims;
+    
+    /* Initialize permutation array */
+    uint32_t *pidx = (uint32_t *)malloc(sizeof(uint32_t) * n);
+    for (uint32_t i = 0; i < n; i++)
+    {
+        pidx[i] = i;
+    }
+    
+    float *bbox = (float *)malloc(2 * sizeof(float) * no_dims);
+    get_bounding_box_float(pa, pidx, no_dims, n, bbox);
+    tree->bbox = bbox;
+
+    /* Construct subtree on full dataset */
+    tree->root = (struct Node_float *)construct_subtree_float(pa, pidx, no_dims, 0, n, bsp, bbox);
+
+    tree->pidx = pidx;
+    return tree;
+}
+
+/************************************************
+Create a tree node.
+Params:
+    start_idx : index of first data point to use
+    n :  number of data points    
+************************************************/
+Node_float* create_node_float(uint32_t start_idx, uint32_t n, int is_leaf)
+{
+    Node_float *new_node; 
+    if (is_leaf)
+    {
+        /*
+            Allocate only the part of the struct that will be used in a leaf node.
+            This relies on the C99 specification of struct layout conservation and padding and 
+            that dereferencing is never attempted for the node pointers in a leaf.
+        */
+        new_node = (Node_float *)malloc(sizeof(Node_float) - 2 * sizeof(Node_float *));
+    }
+    else
+    {
+        new_node = (Node_float *)malloc(sizeof(Node_float));
+    }
+    new_node->n = n;
+    new_node->start_idx = start_idx;
+    return new_node;
+}
+
+/************************************************
+Delete subtree
+Params:
+    root : root node of subtree to delete
+************************************************/
+void delete_subtree_float(Node_float *root)
+{
+    if (root->cut_dim != -1)
+    {
+        delete_subtree_float((Node_float *)root->left_child);
+        delete_subtree_float((Node_float *)root->right_child);
+    }
+    free(root);
+}
+
+/************************************************
+Delete tree
+Params:
+    tree : Tree struct of kd tree
+************************************************/
+void delete_tree_float(Tree_float *tree)
+{
+    delete_subtree_float((Node_float *)tree->root);
+    free(tree->bbox);
+    free(tree->pidx);
+    free(tree);
+}
+
+/************************************************
+Print
+************************************************/
+void print_tree_float(Node_float *root, int level)
+{
+    for (int i = 0; i < level; i++)
+    {
+        printf(" ");
+    }
+    printf("(cut_val: %f, cut_dim: %i)\n", root->cut_val, root->cut_dim);
+    if (root->cut_dim != -1)
+        print_tree_float((Node_float *)root->left_child, level + 1);
+    if (root->cut_dim != -1)
+        print_tree_float((Node_float *)root->right_child, level + 1);
+}
+
+/************************************************
+Calculate squared cartesian distance between points
+Params:
+    point1_coord : point 1
+    point2_coord : point 2
+************************************************/
+float calc_dist_float(float *point1_coord, float *point2_coord, int8_t no_dims)
+{
+    /* Calculate squared distance */    
+    float dist = 0, dim_dist;
+    for (int8_t i = 0; i < no_dims; i++)
+    {
+        dim_dist = point2_coord[i] - point1_coord[i];
+        dist += dim_dist * dim_dist;
+    }
+    return dist;
+}
+
+/************************************************
+Get squared distance from point to cube in specified dimension
+Params:
+    dim : dimension
+    point_coord : cartesian coordinates of point
+    bbox : cube
+************************************************/
+float get_cube_offset_float(int8_t dim, float *point_coord, float *bbox)
+{
+    float dim_coord = point_coord[dim];
+    
+    if (dim_coord < bbox[2 * dim])
+    {
+        /* Left of cube in dimension */
+        return dim_coord - bbox[2 * dim];  
+    }
+    else if (dim_coord > bbox[2 * dim + 1])
+    {
+        /* Right of cube in dimension */
+        return dim_coord - bbox[2 * dim + 1];
+    }
+    else
+    {
+        /* Inside cube in dimension */
+        return 0.;
+    }    
+}
+
+/************************************************
+Get minimum squared distance between point and cube.
+Params:
+    point_coord : cartesian coordinates of point
+    no_dims : number of dimensions
+    bbox : cube
+************************************************/
+float get_min_dist_float(float *point_coord, int8_t no_dims, float *bbox)
+{
+    float cube_offset = 0, cube_offset_dim;
+
+    for (int8_t i = 0; i < no_dims; i++)
+    {
+        cube_offset_dim = get_cube_offset_float(i, point_coord, bbox);
+        cube_offset += cube_offset_dim * cube_offset_dim; 
+    }
+
+    return cube_offset;
+}
+
+/************************************************
+Search a leaf node for closest point
+Params:
+    pa : data points
+    pidx : permutation index of data points
+    no_dims : number of dimensions    
+    start_idx : index of first data point to use
+    size :  number of data points
+    point_coord : query point
+    closest_idx : index of closest data point found (return)
+    closest_dist : distance to closest point (return) 
+************************************************/
+void search_leaf_float(float *restrict pa, uint32_t *restrict pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, float *restrict point_coord, 
+                 uint32_t k, uint32_t *restrict closest_idx, float *restrict closest_dist)
+{
+    float cur_dist;
+    /* Loop through all points in leaf */    
+    for (uint32_t i = 0; i < n; i++)
+    {
+        /* Get distance to query point */
+        cur_dist = calc_dist_float(&PA(start_idx + i, 0), point_coord, no_dims);
+        /* Update closest info if new point is closest so far*/
+        if (cur_dist < closest_dist[k - 1])
+        {
+            insert_point_float(closest_idx, closest_dist, pidx[start_idx + i], cur_dist, k);
+        }
+    }
+}
+
+/************************************************
+Search subtree for nearest to query point
+Params:
+    root : root node of subtree
+    pa : data points
+    pidx : permutation index of data points
+    no_dims : number of dimensions
+    point_coord : query point
+    min_dist : minumum distance to nearest neighbour
+    closest_idx : index of closest data point found (return)
+    closest_dist : distance to closest point (return) 
+************************************************/
+void search_splitnode_float(Node_float *root, float *pa, uint32_t *pidx, int8_t no_dims, float *point_coord, 
+                      float min_dist, uint32_t k, float distance_upper_bound, float eps_fac, uint32_t *closest_idx, float *closest_dist)
+{
+    int8_t dim;
+    float dist_left, dist_right;
+    float new_offset;
+    float box_diff;
+    
+    /* Skip if distance bound exeeded */
+    if (min_dist > distance_upper_bound)
+    {
+        return;
+    }
+
+    dim = root->cut_dim;
+    
+    /* Handle leaf node */
+    if (dim == -1)
+    {
+        search_leaf_float(pa, pidx, no_dims, root->start_idx, root->n, point_coord, k, closest_idx, closest_dist);
+        return;
+    }
+    
+    /* Get distance to cutting plane */
+    new_offset = point_coord[dim] - root->cut_val;
+    
+    if (new_offset < 0)
+    {
+        /* Left of cutting plane */
+        dist_left = min_dist;
+        if (dist_left < closest_dist[k - 1] * eps_fac)
+        {
+            /* Search left subtree if minimum distance is below limit */ 
+            search_splitnode_float((Node_float *)root->left_child, pa, pidx, no_dims, point_coord, dist_left, k, distance_upper_bound, eps_fac, closest_idx, closest_dist);
+        }
+        
+        /* Right of cutting plane. Update minimum distance. 
+           See Algorithms for Fast Vector Quantization
+           Sunil Arya and David M. Mount. */
+        box_diff = root->cut_bounds_lv - point_coord[dim];
+        if (box_diff < 0)
+        {			
+		box_diff = 0;
+        }
+        dist_right = min_dist - box_diff * box_diff + new_offset * new_offset;
+        if (dist_right < closest_dist[k - 1] * eps_fac)
+        {
+            /* Search right subtree if minimum distance is below limit*/ 
+            search_splitnode_float((Node_float *)root->right_child, pa, pidx, no_dims, point_coord, dist_right, k, distance_upper_bound, eps_fac, closest_idx, closest_dist);
+        }
+    }
+    else
+    {
+        /* Right of cutting plane */
+        dist_right = min_dist;
+        if (dist_right < closest_dist[k - 1] * eps_fac)
+        {
+            /* Search right subtree if minimum distance is below limit*/ 
+            search_splitnode_float((Node_float *)root->right_child, pa, pidx, no_dims, point_coord, dist_right, k, distance_upper_bound, eps_fac, closest_idx, closest_dist);
+        }
+        
+        /* Left of cutting plane. Update minimum distance.
+           See Algorithms for Fast Vector Quantization
+           Sunil Arya and David M. Mount. */
+        box_diff = point_coord[dim] - root->cut_bounds_hv;
+        if (box_diff < 0)
+        {			
+        	box_diff = 0;
+        }
+        dist_left = min_dist - box_diff * box_diff + new_offset * new_offset;
+	  if (dist_left < closest_dist[k - 1] * eps_fac)
+        {
+            /* Search left subtree if minimum distance is below limit*/ 
+            search_splitnode_float((Node_float *)root->left_child, pa, pidx, no_dims, point_coord, dist_left, k, distance_upper_bound, eps_fac, closest_idx, closest_dist);
+        }
+    }
+}
+
+/************************************************
+Search for nearest neighbour for a set of query points
+Params:
+    tree : Tree struct of kd tree
+    pa : data points
+    pidx : permutation index of data points
+    point_coords : query points
+    num_points : number of query points
+    closest_idx : index of closest data point found (return)
+    closest_dist : distance to closest point (return) 
+************************************************/
+void search_tree_float(Tree_float *tree, float *pa, float *point_coords, 
+                 uint32_t num_points, uint32_t k, float distance_upper_bound,
+                 float eps, uint32_t *closest_idxs, float *closest_dists)
+{
+    float min_dist;
+    float eps_fac = 1 / ((1 + eps) * (1 + eps));
+    int8_t no_dims = tree->no_dims;
+    float *bbox = tree->bbox;
+    uint32_t *pidx = tree->pidx;
+    Node_float *root = (Node_float *)tree->root;
+
+    /* Queries are OpenMP enabled */
+    #pragma omp parallel
+    {
+        /* The low chunk size is important to avoid L2 cache trashing  
+           for spatial coherent query datasets
+        */
+        #pragma omp for schedule(static, 100) nowait
+        for (uint32_t i = 0; i < num_points; i++)
+        {
+            for (uint32_t j = 0; j < k; j++)
+            {
+                closest_idxs[i * k + j] = UINT32_MAX;
+                closest_dists[i * k + j] = DBL_MAX;
+            }
+            min_dist = get_min_dist_float(point_coords + no_dims * i, no_dims, bbox);
+            search_splitnode_float(root, pa, pidx, no_dims, point_coords + no_dims * i, min_dist,
+                             k, distance_upper_bound, eps_fac, &closest_idxs[i * k], &closest_dists[i * k]);
+        }
+    }
+}
+
+/************************************************
+Insert point into priority queue
+Params:
+    closest_idx : index queue
+    closest_dist : distance queue
+    pidx : permutation index of data points
+    cur_dist : distance to point inserted
+    k : number of neighbours
+************************************************/
+void insert_point_double(uint32_t *closest_idx, double *closest_dist, uint32_t pidx, double cur_dist, uint32_t k)
+{
+    int i;
+    for (i = k - 1; i > 0; i--)
+    {
+        if (closest_dist[i - 1] > cur_dist)
+        {
+            closest_dist[i] = closest_dist[i - 1];
+            closest_idx[i] = closest_idx[i - 1];
+        }
+        else 
+        {
+            break;
+        }
+    }
+    closest_idx[i] = pidx;
+    closest_dist[i] = cur_dist;
+}
+
+/************************************************
+Get the bounding box of a set of points
+Params:
+    pa : data points
+    pidx : permutation index of data points
+    no_dims: number of dimensions
+    n : number of points
+    bbox : bounding box (return)
+************************************************/
+void get_bounding_box_double(double *pa, uint32_t *pidx, int8_t no_dims, uint32_t n, double *bbox)
+{
+    double cur;
+    int8_t bbox_idx;
+
+    /* Use first data point to initialize */
+    for (int8_t i = 0; i < no_dims; i++)
+    {
+        bbox[2 * i] = bbox[2 * i + 1] = PA(0, i);
+    }
+
+    /* Update using rest of data points */
+    for (uint32_t i = 1; i < n; i++)
+    {
+        for (int8_t j = 0; j < no_dims; j++)
+        {
+            bbox_idx = 2 * j;
+            cur = PA(i, j);
+            if (cur < bbox[bbox_idx])
+            {
+                bbox[bbox_idx] = cur;
+            }
+            else if (cur > bbox[bbox_idx + 1])
+            {
+                bbox[bbox_idx + 1] = cur;
+            }
+        }
+    }
+}
+
+/************************************************
+Partition a range of data points by manipulation the permutation index.
+The sliding midpoint rule is used for the partitioning.
+Params:
+    pa : data points
+    pidx : permutation index of data points
+    no_dims: number of dimensions
+    start_idx : index of first data point to use
+    n :  number of data points
+    bbox : bounding box of data points
+    cut_dim : dimension used for partition (return)
+    cut_val : value of cutting point (return)
+    n_lo : number of point below cutting plane (return)    
+************************************************/
+int partition_double(double *pa, uint32_t *pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, double *bbox, int8_t *cut_dim, double *cut_val, uint32_t *n_lo)
+{
+    int8_t dim = 0;
+    uint32_t p, q;
+    double size = 0, min_val, max_val, split, side_len, cur_val;
+    uint32_t end_idx = start_idx + n - 1;
+    
+    /* Find largest bounding box side */
+    for (int8_t i = 0; i < no_dims; i++)
+    {
+        side_len = bbox[2 * i + 1] - bbox[2 * i];
+        if (side_len > size)
+        {
+            dim = i;
+            size = side_len;
+        }
+    }
+    
+    min_val = bbox[2 * dim];
+    max_val = bbox[2 * dim + 1];
+    
+    /* Check for zero length or inconsistent */
+    if (min_val >= max_val)
+        return 1;
+    
+    /* Use middle for splitting */    
+    split = (min_val + max_val) / 2;
+    
+    /* Partition all data points around middle */
+    p = start_idx;
+    q = end_idx;
+    while (p <= q)
+    {
+        if (PA(p, dim) < split)
+        {
+            p++;
+        }
+        else if (PA(q, dim) >= split)
+        {
+            /* Guard for underflow */
+            if (q > 0) 
+            {
+                q--;
+            }
+            else
+            {
+                break; 
+            }   
+        }
+        else
+        {
+            PASWAP(p, q);
+            p++;
+            q--;    
+        } 
+    }
+
+    /* Check for empty splits */
+    if (p == start_idx)
+    {
+        /* No points less than split. 
+           Split at lowest point instead.
+           Minimum 1 point will be in lower box.
+        */
+        
+        uint32_t j = start_idx;
+        split = PA(j, dim);
+        for (uint32_t i = start_idx + 1; i <= end_idx; i++) 
+        {
+            /* Find lowest point */
+            cur_val = PA(i, dim); 
+            if (cur_val < split)
+            {
+                j = i;
+                split = cur_val;
+            }
+        }
+        PASWAP(j, start_idx);
+        p = start_idx + 1;
+    }
+    else if (p == end_idx + 1)
+    {
+        /* No points greater than split. 
+           Split at highest point instead.
+           Minimum 1 point will be in higher box.
+        */
+        
+        uint32_t j = end_idx;
+        split = PA(j, dim);
+        for (uint32_t i = start_idx; i < end_idx; i++)
+        {
+            /* Find highest point */
+            cur_val = PA(i, dim);
+            if (cur_val > split)
+            {
+                j = i;
+                split = cur_val;
+            }    
+        }
+        PASWAP(j, end_idx);
+        p = end_idx;    
+    }
+    
+    /* Set return values */
+    *cut_dim = dim;
+    *cut_val = split;
+    *n_lo = p - start_idx;
+    return 0;
+}
+
+/************************************************
+Construct a sub tree over a range of data points.
+Params:
+    pa : data points
+    pidx : permutation index of data points
+    no_dims: number of dimensions
+    start_idx : index of first data point to use
+    n :  number of data points
+    bsp : number of points per leaf
+    bbox : bounding box of set of data points
+************************************************/
+Node_double* construct_subtree_double(double *pa, uint32_t *pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, uint32_t bsp, double *bbox)
+{
+    /* Create new node */
+    int is_leaf = (n <= bsp);
+    Node_double *root = create_node_double(start_idx, n, is_leaf);
+    if (is_leaf)
+    {   
+        /* Make leaf node */
+        root->cut_dim = -1;     
+    }
+    else
+    {
+        /* Make split node */
+        int rval;
+        int8_t cut_dim;
+        uint32_t n_lo;
+        double  cut_val;
+        
+        /* Partition data set and set node info */
+        rval = partition_double(pa, pidx, no_dims, start_idx, n, bbox, &cut_dim, &cut_val, &n_lo);
+        if (rval == 1)
+        {
+            root->cut_dim = -1;
+            return root;         
+        }
+        root->cut_val = cut_val;
+        root->cut_dim = cut_dim; 
+        
+        /* Recurse on both subsets */
+        double lv = bbox[2 * cut_dim];
+        double hv = bbox[2 * cut_dim + 1];
+        
+        /* Set bounds for cut dimension */
+        root->cut_bounds_lv = lv;
+        root->cut_bounds_hv = hv;
+        
+        /* Update bounding box before call to lower subset and restore after */
+        bbox[2 * cut_dim + 1] = cut_val;
+        root->left_child = (struct Node_double *)construct_subtree_double(pa, pidx, no_dims, start_idx, n_lo, bsp, bbox); 
+        bbox[2 * cut_dim + 1] = hv;
+        
+        /* Update bounding box before call to higher subset and restore after */
+        bbox[2 * cut_dim] = cut_val;
+        root->right_child = (struct Node_double *)construct_subtree_double(pa, pidx, no_dims, start_idx + n_lo, n - n_lo, bsp, bbox); 
+        bbox[2 * cut_dim] = lv;   
+    }
+    return root;    
+}
+
+/************************************************
+Construct a tree over data points.
+Params:
+    pa : data points
+    no_dims: number of dimensions
+    n :  number of data points
+    bsp : number of points per leaf
+************************************************/
+Tree_double* construct_tree_double(double *pa, int8_t no_dims, uint32_t n, uint32_t bsp)
+{
+    Tree_double *tree = (Tree_double *)malloc(sizeof(Tree_double));
+    tree->no_dims = no_dims;
+    
+    /* Initialize permutation array */
+    uint32_t *pidx = (uint32_t *)malloc(sizeof(uint32_t) * n);
+    for (uint32_t i = 0; i < n; i++)
+    {
+        pidx[i] = i;
+    }
+    
+    double *bbox = (double *)malloc(2 * sizeof(double) * no_dims);
+    get_bounding_box_double(pa, pidx, no_dims, n, bbox);
+    tree->bbox = bbox;
+
+    /* Construct subtree on full dataset */
+    tree->root = (struct Node_double *)construct_subtree_double(pa, pidx, no_dims, 0, n, bsp, bbox);
+
+    tree->pidx = pidx;
+    return tree;
+}
+
+/************************************************
+Create a tree node.
+Params:
+    start_idx : index of first data point to use
+    n :  number of data points    
+************************************************/
+Node_double* create_node_double(uint32_t start_idx, uint32_t n, int is_leaf)
+{
+    Node_double *new_node; 
+    if (is_leaf)
+    {
+        /*
+            Allocate only the part of the struct that will be used in a leaf node.
+            This relies on the C99 specification of struct layout conservation and padding and 
+            that dereferencing is never attempted for the node pointers in a leaf.
+        */
+        new_node = (Node_double *)malloc(sizeof(Node_double) - 2 * sizeof(Node_double *));
+    }
+    else
+    {
+        new_node = (Node_double *)malloc(sizeof(Node_double));
+    }
+    new_node->n = n;
+    new_node->start_idx = start_idx;
+    return new_node;
+}
+
+/************************************************
+Delete subtree
+Params:
+    root : root node of subtree to delete
+************************************************/
+void delete_subtree_double(Node_double *root)
+{
+    if (root->cut_dim != -1)
+    {
+        delete_subtree_double((Node_double *)root->left_child);
+        delete_subtree_double((Node_double *)root->right_child);
+    }
+    free(root);
+}
+
+/************************************************
+Delete tree
+Params:
+    tree : Tree struct of kd tree
+************************************************/
+void delete_tree_double(Tree_double *tree)
+{
+    delete_subtree_double((Node_double *)tree->root);
+    free(tree->bbox);
+    free(tree->pidx);
+    free(tree);
+}
+
+/************************************************
+Print
+************************************************/
+void print_tree_double(Node_double *root, int level)
+{
+    for (int i = 0; i < level; i++)
+    {
+        printf(" ");
+    }
+    printf("(cut_val: %f, cut_dim: %i)\n", root->cut_val, root->cut_dim);
+    if (root->cut_dim != -1)
+        print_tree_double((Node_double *)root->left_child, level + 1);
+    if (root->cut_dim != -1)
+        print_tree_double((Node_double *)root->right_child, level + 1);
+}
+
+/************************************************
+Calculate squared cartesian distance between points
+Params:
+    point1_coord : point 1
+    point2_coord : point 2
+************************************************/
+double calc_dist_double(double *point1_coord, double *point2_coord, int8_t no_dims)
+{
+    /* Calculate squared distance */    
+    double dist = 0, dim_dist;
+    for (int8_t i = 0; i < no_dims; i++)
+    {
+        dim_dist = point2_coord[i] - point1_coord[i];
+        dist += dim_dist * dim_dist;
+    }
+    return dist;
+}
+
+/************************************************
+Get squared distance from point to cube in specified dimension
+Params:
+    dim : dimension
+    point_coord : cartesian coordinates of point
+    bbox : cube
+************************************************/
+double get_cube_offset_double(int8_t dim, double *point_coord, double *bbox)
+{
+    double dim_coord = point_coord[dim];
+    
+    if (dim_coord < bbox[2 * dim])
+    {
+        /* Left of cube in dimension */
+        return dim_coord - bbox[2 * dim];  
+    }
+    else if (dim_coord > bbox[2 * dim + 1])
+    {
+        /* Right of cube in dimension */
+        return dim_coord - bbox[2 * dim + 1];
+    }
+    else
+    {
+        /* Inside cube in dimension */
+        return 0.;
+    }    
+}
+
+/************************************************
+Get minimum squared distance between point and cube.
+Params:
+    point_coord : cartesian coordinates of point
+    no_dims : number of dimensions
+    bbox : cube
+************************************************/
+double get_min_dist_double(double *point_coord, int8_t no_dims, double *bbox)
+{
+    double cube_offset = 0, cube_offset_dim;
+
+    for (int8_t i = 0; i < no_dims; i++)
+    {
+        cube_offset_dim = get_cube_offset_double(i, point_coord, bbox);
+        cube_offset += cube_offset_dim * cube_offset_dim; 
+    }
+
+    return cube_offset;
+}
+
+/************************************************
+Search a leaf node for closest point
+Params:
+    pa : data points
+    pidx : permutation index of data points
+    no_dims : number of dimensions    
+    start_idx : index of first data point to use
+    size :  number of data points
+    point_coord : query point
+    closest_idx : index of closest data point found (return)
+    closest_dist : distance to closest point (return) 
+************************************************/
+void search_leaf_double(double *restrict pa, uint32_t *restrict pidx, int8_t no_dims, uint32_t start_idx, uint32_t n, double *restrict point_coord, 
+                 uint32_t k, uint32_t *restrict closest_idx, double *restrict closest_dist)
+{
+    double cur_dist;
+    /* Loop through all points in leaf */    
+    for (uint32_t i = 0; i < n; i++)
+    {
+        /* Get distance to query point */
+        cur_dist = calc_dist_double(&PA(start_idx + i, 0), point_coord, no_dims);
+        /* Update closest info if new point is closest so far*/
+        if (cur_dist < closest_dist[k - 1])
+        {
+            insert_point_double(closest_idx, closest_dist, pidx[start_idx + i], cur_dist, k);
+        }
+    }
+}
+
+/************************************************
+Search subtree for nearest to query point
+Params:
+    root : root node of subtree
+    pa : data points
+    pidx : permutation index of data points
+    no_dims : number of dimensions
+    point_coord : query point
+    min_dist : minumum distance to nearest neighbour
+    closest_idx : index of closest data point found (return)
+    closest_dist : distance to closest point (return) 
+************************************************/
+void search_splitnode_double(Node_double *root, double *pa, uint32_t *pidx, int8_t no_dims, double *point_coord, 
+                      double min_dist, uint32_t k, double distance_upper_bound, double eps_fac, uint32_t *closest_idx, double *closest_dist)
+{
+    int8_t dim;
+    double dist_left, dist_right;
+    double new_offset;
+    double box_diff;
+    
+    /* Skip if distance bound exeeded */
+    if (min_dist > distance_upper_bound)
+    {
+        return;
+    }
+
+    dim = root->cut_dim;
+    
+    /* Handle leaf node */
+    if (dim == -1)
+    {
+        search_leaf_double(pa, pidx, no_dims, root->start_idx, root->n, point_coord, k, closest_idx, closest_dist);
+        return;
+    }
+    
+    /* Get distance to cutting plane */
+    new_offset = point_coord[dim] - root->cut_val;
+    
+    if (new_offset < 0)
+    {
+        /* Left of cutting plane */
+        dist_left = min_dist;
+        if (dist_left < closest_dist[k - 1] * eps_fac)
+        {
+            /* Search left subtree if minimum distance is below limit */ 
+            search_splitnode_double((Node_double *)root->left_child, pa, pidx, no_dims, point_coord, dist_left, k, distance_upper_bound, eps_fac, closest_idx, closest_dist);
+        }
+        
+        /* Right of cutting plane. Update minimum distance. 
+           See Algorithms for Fast Vector Quantization
+           Sunil Arya and David M. Mount. */
+        box_diff = root->cut_bounds_lv - point_coord[dim];
+        if (box_diff < 0)
+        {			
+		box_diff = 0;
+        }
+        dist_right = min_dist - box_diff * box_diff + new_offset * new_offset;
+        if (dist_right < closest_dist[k - 1] * eps_fac)
+        {
+            /* Search right subtree if minimum distance is below limit*/ 
+            search_splitnode_double((Node_double *)root->right_child, pa, pidx, no_dims, point_coord, dist_right, k, distance_upper_bound, eps_fac, closest_idx, closest_dist);
+        }
+    }
+    else
+    {
+        /* Right of cutting plane */
+        dist_right = min_dist;
+        if (dist_right < closest_dist[k - 1] * eps_fac)
+        {
+            /* Search right subtree if minimum distance is below limit*/ 
+            search_splitnode_double((Node_double *)root->right_child, pa, pidx, no_dims, point_coord, dist_right, k, distance_upper_bound, eps_fac, closest_idx, closest_dist);
+        }
+        
+        /* Left of cutting plane. Update minimum distance.
+           See Algorithms for Fast Vector Quantization
+           Sunil Arya and David M. Mount. */
+        box_diff = point_coord[dim] - root->cut_bounds_hv;
+        if (box_diff < 0)
+        {			
+        	box_diff = 0;
+        }
+        dist_left = min_dist - box_diff * box_diff + new_offset * new_offset;
+	  if (dist_left < closest_dist[k - 1] * eps_fac)
+        {
+            /* Search left subtree if minimum distance is below limit*/ 
+            search_splitnode_double((Node_double *)root->left_child, pa, pidx, no_dims, point_coord, dist_left, k, distance_upper_bound, eps_fac, closest_idx, closest_dist);
+        }
+    }
+}
+
+/************************************************
+Search for nearest neighbour for a set of query points
+Params:
+    tree : Tree struct of kd tree
+    pa : data points
+    pidx : permutation index of data points
+    point_coords : query points
+    num_points : number of query points
+    closest_idx : index of closest data point found (return)
+    closest_dist : distance to closest point (return) 
+************************************************/
+void search_tree_double(Tree_double *tree, double *pa, double *point_coords, 
+                 uint32_t num_points, uint32_t k, double distance_upper_bound,
+                 double eps, uint32_t *closest_idxs, double *closest_dists)
+{
+    double min_dist;
+    double eps_fac = 1 / ((1 + eps) * (1 + eps));
+    int8_t no_dims = tree->no_dims;
+    double *bbox = tree->bbox;
+    uint32_t *pidx = tree->pidx;
+    Node_double *root = (Node_double *)tree->root;
+
+    /* Queries are OpenMP enabled */
+    #pragma omp parallel
+    {
+        /* The low chunk size is important to avoid L2 cache trashing  
+           for spatial coherent query datasets
+        */
+        #pragma omp for schedule(static, 100) nowait
+        for (uint32_t i = 0; i < num_points; i++)
+        {
+            for (uint32_t j = 0; j < k; j++)
+            {
+                closest_idxs[i * k + j] = UINT32_MAX;
+                closest_dists[i * k + j] = DBL_MAX;
+            }
+            min_dist = get_min_dist_double(point_coords + no_dims * i, no_dims, bbox);
+            search_splitnode_double(root, pa, pidx, no_dims, point_coords + no_dims * i, min_dist,
+                             k, distance_upper_bound, eps_fac, &closest_idxs[i * k], &closest_dists[i * k]);
+        }
+    }
+}
diff --git a/pykdtree/kdtree.c b/pykdtree/kdtree.c
new file mode 100644
index 0000000..729c087
--- /dev/null
+++ b/pykdtree/kdtree.c
@@ -0,0 +1,8244 @@
+/* Generated by Cython 0.18 on Tue May 28 10:49:15 2013 */
+
+#define PY_SSIZE_T_CLEAN
+#include "Python.h"
+#ifndef Py_PYTHON_H
+    #error Python headers needed to compile C extensions, please install development version of Python.
+#elif PY_VERSION_HEX < 0x02040000
+    #error Cython requires Python 2.4+.
+#else
+#include <stddef.h> /* For offsetof */
+#ifndef offsetof
+#define offsetof(type, member) ( (size_t) & ((type*)0) -> member )
+#endif
+#if !defined(WIN32) && !defined(MS_WINDOWS)
+  #ifndef __stdcall
+    #define __stdcall
+  #endif
+  #ifndef __cdecl
+    #define __cdecl
+  #endif
+  #ifndef __fastcall
+    #define __fastcall
+  #endif
+#endif
+#ifndef DL_IMPORT
+  #define DL_IMPORT(t) t
+#endif
+#ifndef DL_EXPORT
+  #define DL_EXPORT(t) t
+#endif
+#ifndef PY_LONG_LONG
+  #define PY_LONG_LONG LONG_LONG
+#endif
+#ifndef Py_HUGE_VAL
+  #define Py_HUGE_VAL HUGE_VAL
+#endif
+#ifdef PYPY_VERSION
+#define CYTHON_COMPILING_IN_PYPY 1
+#define CYTHON_COMPILING_IN_CPYTHON 0
+#else
+#define CYTHON_COMPILING_IN_PYPY 0
+#define CYTHON_COMPILING_IN_CPYTHON 1
+#endif
+#if PY_VERSION_HEX < 0x02050000
+  typedef int Py_ssize_t;
+  #define PY_SSIZE_T_MAX INT_MAX
+  #define PY_SSIZE_T_MIN INT_MIN
+  #define PY_FORMAT_SIZE_T ""
+  #define CYTHON_FORMAT_SSIZE_T ""
+  #define PyInt_FromSsize_t(z) PyInt_FromLong(z)
+  #define PyInt_AsSsize_t(o)   __Pyx_PyInt_AsInt(o)
+  #define PyNumber_Index(o)    ((PyNumber_Check(o) && !PyFloat_Check(o)) ? PyNumber_Int(o) : \
+                                (PyErr_Format(PyExc_TypeError, \
+                                              "expected index value, got %.200s", Py_TYPE(o)->tp_name), \
+                                 (PyObject*)0))
+  #define __Pyx_PyIndex_Check(o) (PyNumber_Check(o) && !PyFloat_Check(o) && \
+                                  !PyComplex_Check(o))
+  #define PyIndex_Check __Pyx_PyIndex_Check
+  #define PyErr_WarnEx(category, message, stacklevel) PyErr_Warn(category, message)
+  #define __PYX_BUILD_PY_SSIZE_T "i"
+#else
+  #define __PYX_BUILD_PY_SSIZE_T "n"
+  #define CYTHON_FORMAT_SSIZE_T "z"
+  #define __Pyx_PyIndex_Check PyIndex_Check
+#endif
+#if PY_VERSION_HEX < 0x02060000
+  #define Py_REFCNT(ob) (((PyObject*)(ob))->ob_refcnt)
+  #define Py_TYPE(ob)   (((PyObject*)(ob))->ob_type)
+  #define Py_SIZE(ob)   (((PyVarObject*)(ob))->ob_size)
+  #define PyVarObject_HEAD_INIT(type, size) \
+          PyObject_HEAD_INIT(type) size,
+  #define PyType_Modified(t)
+  typedef struct {
+     void *buf;
+     PyObject *obj;
+     Py_ssize_t len;
+     Py_ssize_t itemsize;
+     int readonly;
+     int ndim;
+     char *format;
+     Py_ssize_t *shape;
+     Py_ssize_t *strides;
+     Py_ssize_t *suboffsets;
+     void *internal;
+  } Py_buffer;
+  #define PyBUF_SIMPLE 0
+  #define PyBUF_WRITABLE 0x0001
+  #define PyBUF_FORMAT 0x0004
+  #define PyBUF_ND 0x0008
+  #define PyBUF_STRIDES (0x0010 | PyBUF_ND)
+  #define PyBUF_C_CONTIGUOUS (0x0020 | PyBUF_STRIDES)
+  #define PyBUF_F_CONTIGUOUS (0x0040 | PyBUF_STRIDES)
+  #define PyBUF_ANY_CONTIGUOUS (0x0080 | PyBUF_STRIDES)
+  #define PyBUF_INDIRECT (0x0100 | PyBUF_STRIDES)
+  #define PyBUF_RECORDS (PyBUF_STRIDES | PyBUF_FORMAT | PyBUF_WRITABLE)
+  #define PyBUF_FULL (PyBUF_INDIRECT | PyBUF_FORMAT | PyBUF_WRITABLE)
+  typedef int (*getbufferproc)(PyObject *, Py_buffer *, int);
+  typedef void (*releasebufferproc)(PyObject *, Py_buffer *);
+#endif
+#if PY_MAJOR_VERSION < 3
+  #define __Pyx_BUILTIN_MODULE_NAME "__builtin__"
+  #define __Pyx_PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
+          PyCode_New(a, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
+#else
+  #define __Pyx_BUILTIN_MODULE_NAME "builtins"
+  #define __Pyx_PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos) \
+          PyCode_New(a, k, l, s, f, code, c, n, v, fv, cell, fn, name, fline, lnos)
+#endif
+#if PY_MAJOR_VERSION < 3 && PY_MINOR_VERSION < 6
+  #define PyUnicode_FromString(s) PyUnicode_Decode(s, strlen(s), "UTF-8", "strict")
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define Py_TPFLAGS_CHECKTYPES 0
+  #define Py_TPFLAGS_HAVE_INDEX 0
+#endif
+#if (PY_VERSION_HEX < 0x02060000) || (PY_MAJOR_VERSION >= 3)
+  #define Py_TPFLAGS_HAVE_NEWBUFFER 0
+#endif
+#if PY_VERSION_HEX > 0x03030000 && defined(PyUnicode_KIND)
+  #define CYTHON_PEP393_ENABLED 1
+  #define __Pyx_PyUnicode_READY(op)       (likely(PyUnicode_IS_READY(op)) ? \
+                                              0 : _PyUnicode_Ready((PyObject *)(op)))
+  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GET_LENGTH(u)
+  #define __Pyx_PyUnicode_READ_CHAR(u, i) PyUnicode_READ_CHAR(u, i)
+  #define __Pyx_PyUnicode_READ(k, d, i)   PyUnicode_READ(k, d, i)
+#else
+  #define CYTHON_PEP393_ENABLED 0
+  #define __Pyx_PyUnicode_READY(op)       (0)
+  #define __Pyx_PyUnicode_GET_LENGTH(u)   PyUnicode_GET_SIZE(u)
+  #define __Pyx_PyUnicode_READ_CHAR(u, i) ((Py_UCS4)(PyUnicode_AS_UNICODE(u)[i]))
+  #define __Pyx_PyUnicode_READ(k, d, i)   ((k=k), (Py_UCS4)(((Py_UNICODE*)d)[i]))
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define PyBaseString_Type            PyUnicode_Type
+  #define PyStringObject               PyUnicodeObject
+  #define PyString_Type                PyUnicode_Type
+  #define PyString_Check               PyUnicode_Check
+  #define PyString_CheckExact          PyUnicode_CheckExact
+#endif
+#if PY_VERSION_HEX < 0x02060000
+  #define PyBytesObject                PyStringObject
+  #define PyBytes_Type                 PyString_Type
+  #define PyBytes_Check                PyString_Check
+  #define PyBytes_CheckExact           PyString_CheckExact
+  #define PyBytes_FromString           PyString_FromString
+  #define PyBytes_FromStringAndSize    PyString_FromStringAndSize
+  #define PyBytes_FromFormat           PyString_FromFormat
+  #define PyBytes_DecodeEscape         PyString_DecodeEscape
+  #define PyBytes_AsString             PyString_AsString
+  #define PyBytes_AsStringAndSize      PyString_AsStringAndSize
+  #define PyBytes_Size                 PyString_Size
+  #define PyBytes_AS_STRING            PyString_AS_STRING
+  #define PyBytes_GET_SIZE             PyString_GET_SIZE
+  #define PyBytes_Repr                 PyString_Repr
+  #define PyBytes_Concat               PyString_Concat
+  #define PyBytes_ConcatAndDel         PyString_ConcatAndDel
+#endif
+#if PY_VERSION_HEX < 0x02060000
+  #define PySet_Check(obj)             PyObject_TypeCheck(obj, &PySet_Type)
+  #define PyFrozenSet_Check(obj)       PyObject_TypeCheck(obj, &PyFrozenSet_Type)
+#endif
+#ifndef PySet_CheckExact
+  #define PySet_CheckExact(obj)        (Py_TYPE(obj) == &PySet_Type)
+#endif
+#define __Pyx_TypeCheck(obj, type) PyObject_TypeCheck(obj, (PyTypeObject *)type)
+#if PY_MAJOR_VERSION >= 3
+  #define PyIntObject                  PyLongObject
+  #define PyInt_Type                   PyLong_Type
+  #define PyInt_Check(op)              PyLong_Check(op)
+  #define PyInt_CheckExact(op)         PyLong_CheckExact(op)
+  #define PyInt_FromString             PyLong_FromString
+  #define PyInt_FromUnicode            PyLong_FromUnicode
+  #define PyInt_FromLong               PyLong_FromLong
+  #define PyInt_FromSize_t             PyLong_FromSize_t
+  #define PyInt_FromSsize_t            PyLong_FromSsize_t
+  #define PyInt_AsLong                 PyLong_AsLong
+  #define PyInt_AS_LONG                PyLong_AS_LONG
+  #define PyInt_AsSsize_t              PyLong_AsSsize_t
+  #define PyInt_AsUnsignedLongMask     PyLong_AsUnsignedLongMask
+  #define PyInt_AsUnsignedLongLongMask PyLong_AsUnsignedLongLongMask
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define PyBoolObject                 PyLongObject
+#endif
+#if PY_VERSION_HEX < 0x03020000
+  typedef long Py_hash_t;
+  #define __Pyx_PyInt_FromHash_t PyInt_FromLong
+  #define __Pyx_PyInt_AsHash_t   PyInt_AsLong
+#else
+  #define __Pyx_PyInt_FromHash_t PyInt_FromSsize_t
+  #define __Pyx_PyInt_AsHash_t   PyInt_AsSsize_t
+#endif
+#if (PY_MAJOR_VERSION < 3) || (PY_VERSION_HEX >= 0x03010300)
+  #define __Pyx_PySequence_GetSlice(obj, a, b) PySequence_GetSlice(obj, a, b)
+  #define __Pyx_PySequence_SetSlice(obj, a, b, value) PySequence_SetSlice(obj, a, b, value)
+  #define __Pyx_PySequence_DelSlice(obj, a, b) PySequence_DelSlice(obj, a, b)
+#else
+  #define __Pyx_PySequence_GetSlice(obj, a, b) (unlikely(!(obj)) ? \
+        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), (PyObject*)0) : \
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_GetSlice(obj, a, b)) : \
+            (PyErr_Format(PyExc_TypeError, "'%.200s' object is unsliceable", (obj)->ob_type->tp_name), (PyObject*)0)))
+  #define __Pyx_PySequence_SetSlice(obj, a, b, value) (unlikely(!(obj)) ? \
+        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), -1) : \
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_SetSlice(obj, a, b, value)) : \
+            (PyErr_Format(PyExc_TypeError, "'%.200s' object doesn't support slice assignment", (obj)->ob_type->tp_name), -1)))
+  #define __Pyx_PySequence_DelSlice(obj, a, b) (unlikely(!(obj)) ? \
+        (PyErr_SetString(PyExc_SystemError, "null argument to internal routine"), -1) : \
+        (likely((obj)->ob_type->tp_as_mapping) ? (PySequence_DelSlice(obj, a, b)) : \
+            (PyErr_Format(PyExc_TypeError, "'%.200s' object doesn't support slice deletion", (obj)->ob_type->tp_name), -1)))
+#endif
+#if PY_MAJOR_VERSION >= 3
+  #define PyMethod_New(func, self, klass) ((self) ? PyMethod_New(func, self) : PyInstanceMethod_New(func))
+#endif
+#if PY_VERSION_HEX < 0x02050000
+  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),((char *)(n)))
+  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),((char *)(n)),(a))
+  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),((char *)(n)))
+#else
+  #define __Pyx_GetAttrString(o,n)   PyObject_GetAttrString((o),(n))
+  #define __Pyx_SetAttrString(o,n,a) PyObject_SetAttrString((o),(n),(a))
+  #define __Pyx_DelAttrString(o,n)   PyObject_DelAttrString((o),(n))
+#endif
+#if PY_VERSION_HEX < 0x02050000
+  #define __Pyx_NAMESTR(n) ((char *)(n))
+  #define __Pyx_DOCSTR(n)  ((char *)(n))
+#else
+  #define __Pyx_NAMESTR(n) (n)
+  #define __Pyx_DOCSTR(n)  (n)
+#endif
+
+
+#if PY_MAJOR_VERSION >= 3
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_TrueDivide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceTrueDivide(x,y)
+#else
+  #define __Pyx_PyNumber_Divide(x,y)         PyNumber_Divide(x,y)
+  #define __Pyx_PyNumber_InPlaceDivide(x,y)  PyNumber_InPlaceDivide(x,y)
+#endif
+
+#ifndef __PYX_EXTERN_C
+  #ifdef __cplusplus
+    #define __PYX_EXTERN_C extern "C"
+  #else
+    #define __PYX_EXTERN_C extern
+  #endif
+#endif
+
+#if defined(WIN32) || defined(MS_WINDOWS)
+#define _USE_MATH_DEFINES
+#endif
+#include <math.h>
+#define __PYX_HAVE__pykdtree__kdtree
+#define __PYX_HAVE_API__pykdtree__kdtree
+#include "string.h"
+#include "stdio.h"
+#include "stdlib.h"
+#include "numpy/arrayobject.h"
+#include "numpy/ufuncobject.h"
+#include "stdint.h"
+#ifdef _OPENMP
+#include <omp.h>
+#endif /* _OPENMP */
+
+#ifdef PYREX_WITHOUT_ASSERTIONS
+#define CYTHON_WITHOUT_ASSERTIONS
+#endif
+
+#ifndef CYTHON_INLINE
+  #if defined(__GNUC__)
+    #define CYTHON_INLINE __inline__
+  #elif defined(_MSC_VER)
+    #define CYTHON_INLINE __inline
+  #elif defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
+    #define CYTHON_INLINE inline
+  #else
+    #define CYTHON_INLINE
+  #endif
+#endif
+#ifndef CYTHON_UNUSED
+# if defined(__GNUC__)
+#   if !(defined(__cplusplus)) || (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
+#     define CYTHON_UNUSED __attribute__ ((__unused__))
+#   else
+#     define CYTHON_UNUSED
+#   endif
+# elif defined(__ICC) || (defined(__INTEL_COMPILER) && !defined(_MSC_VER))
+#   define CYTHON_UNUSED __attribute__ ((__unused__))
+# else
+#   define CYTHON_UNUSED
+# endif
+#endif
+typedef struct {PyObject **p; char *s; const long n; const char* encoding; const char is_unicode; const char is_str; const char intern; } __Pyx_StringTabEntry; /*proto*/
+
+#define __Pyx_PyBytes_FromUString(s) PyBytes_FromString((char*)s)
+#define __Pyx_PyBytes_AsUString(s)   ((unsigned char*) PyBytes_AsString(s))
+#define __Pyx_Owned_Py_None(b) (Py_INCREF(Py_None), Py_None)
+#define __Pyx_PyBool_FromLong(b) ((b) ? (Py_INCREF(Py_True), Py_True) : (Py_INCREF(Py_False), Py_False))
+static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject*);
+static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x);
+static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject*);
+static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t);
+static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject*);
+#if CYTHON_COMPILING_IN_CPYTHON
+#define __pyx_PyFloat_AsDouble(x) (PyFloat_CheckExact(x) ? PyFloat_AS_DOUBLE(x) : PyFloat_AsDouble(x))
+#else
+#define __pyx_PyFloat_AsDouble(x) PyFloat_AsDouble(x)
+#endif
+#define __pyx_PyFloat_AsFloat(x) ((float) __pyx_PyFloat_AsDouble(x))
+
+
+#ifdef __GNUC__
+  /* Test for GCC > 2.95 */
+  #if __GNUC__ > 2 || (__GNUC__ == 2 && (__GNUC_MINOR__ > 95))
+    #define likely(x)   __builtin_expect(!!(x), 1)
+    #define unlikely(x) __builtin_expect(!!(x), 0)
+  #else /* __GNUC__ > 2 ... */
+    #define likely(x)   (x)
+    #define unlikely(x) (x)
+  #endif /* __GNUC__ > 2 ... */
+#else /* __GNUC__ */
+  #define likely(x)   (x)
+  #define unlikely(x) (x)
+#endif /* __GNUC__ */
+    
+static PyObject *__pyx_m;
+static PyObject *__pyx_b;
+static PyObject *__pyx_empty_tuple;
+static PyObject *__pyx_empty_bytes;
+static int __pyx_lineno;
+static int __pyx_clineno = 0;
+static const char * __pyx_cfilenm= __FILE__;
+static const char *__pyx_filename;
+
+#if !defined(CYTHON_CCOMPLEX)
+  #if defined(__cplusplus)
+    #define CYTHON_CCOMPLEX 1
+  #elif defined(_Complex_I)
+    #define CYTHON_CCOMPLEX 1
+  #else
+    #define CYTHON_CCOMPLEX 0
+  #endif
+#endif
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    #include <complex>
+  #else
+    #include <complex.h>
+  #endif
+#endif
+#if CYTHON_CCOMPLEX && !defined(__cplusplus) && defined(__sun__) && defined(__GNUC__)
+  #undef _Complex_I
+  #define _Complex_I 1.0fj
+#endif
+
+
+static const char *__pyx_f[] = {
+  "kdtree.pyx",
+  "numpy.pxd",
+  "type.pxd",
+};
+#define IS_UNSIGNED(type) (((type) -1) > 0)
+struct __Pyx_StructField_;
+#define __PYX_BUF_FLAGS_PACKED_STRUCT (1 << 0)
+typedef struct {
+  const char* name; /* for error messages only */
+  struct __Pyx_StructField_* fields;
+  size_t size;     /* sizeof(type) */
+  size_t arraysize[8]; /* length of array in each dimension */
+  int ndim;
+  char typegroup; /* _R_eal, _C_omplex, Signed _I_nt, _U_nsigned int, _S_truct, _P_ointer, _O_bject, c_H_ar */
+  char is_unsigned;
+  int flags;
+} __Pyx_TypeInfo;
+typedef struct __Pyx_StructField_ {
+  __Pyx_TypeInfo* type;
+  const char* name;
+  size_t offset;
+} __Pyx_StructField;
+typedef struct {
+  __Pyx_StructField* field;
+  size_t parent_offset;
+} __Pyx_BufFmt_StackElem;
+typedef struct {
+  __Pyx_StructField root;
+  __Pyx_BufFmt_StackElem* head;
+  size_t fmt_offset;
+  size_t new_count, enc_count;
+  size_t struct_alignment;
+  int is_complex;
+  char enc_type;
+  char new_packmode;
+  char enc_packmode;
+  char is_valid_array;
+} __Pyx_BufFmt_Context;
+
+
+/* "numpy.pxd":723
+ * # in Cython to enable them only on the right systems.
+ * 
+ * ctypedef npy_int8       int8_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_int16      int16_t
+ * ctypedef npy_int32      int32_t
+ */
+typedef npy_int8 __pyx_t_5numpy_int8_t;
+
+/* "numpy.pxd":724
+ * 
+ * ctypedef npy_int8       int8_t
+ * ctypedef npy_int16      int16_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_int32      int32_t
+ * ctypedef npy_int64      int64_t
+ */
+typedef npy_int16 __pyx_t_5numpy_int16_t;
+
+/* "numpy.pxd":725
+ * ctypedef npy_int8       int8_t
+ * ctypedef npy_int16      int16_t
+ * ctypedef npy_int32      int32_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_int64      int64_t
+ * #ctypedef npy_int96      int96_t
+ */
+typedef npy_int32 __pyx_t_5numpy_int32_t;
+
+/* "numpy.pxd":726
+ * ctypedef npy_int16      int16_t
+ * ctypedef npy_int32      int32_t
+ * ctypedef npy_int64      int64_t             # <<<<<<<<<<<<<<
+ * #ctypedef npy_int96      int96_t
+ * #ctypedef npy_int128     int128_t
+ */
+typedef npy_int64 __pyx_t_5numpy_int64_t;
+
+/* "numpy.pxd":730
+ * #ctypedef npy_int128     int128_t
+ * 
+ * ctypedef npy_uint8      uint8_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_uint16     uint16_t
+ * ctypedef npy_uint32     uint32_t
+ */
+typedef npy_uint8 __pyx_t_5numpy_uint8_t;
+
+/* "numpy.pxd":731
+ * 
+ * ctypedef npy_uint8      uint8_t
+ * ctypedef npy_uint16     uint16_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_uint32     uint32_t
+ * ctypedef npy_uint64     uint64_t
+ */
+typedef npy_uint16 __pyx_t_5numpy_uint16_t;
+
+/* "numpy.pxd":732
+ * ctypedef npy_uint8      uint8_t
+ * ctypedef npy_uint16     uint16_t
+ * ctypedef npy_uint32     uint32_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_uint64     uint64_t
+ * #ctypedef npy_uint96     uint96_t
+ */
+typedef npy_uint32 __pyx_t_5numpy_uint32_t;
+
+/* "numpy.pxd":733
+ * ctypedef npy_uint16     uint16_t
+ * ctypedef npy_uint32     uint32_t
+ * ctypedef npy_uint64     uint64_t             # <<<<<<<<<<<<<<
+ * #ctypedef npy_uint96     uint96_t
+ * #ctypedef npy_uint128    uint128_t
+ */
+typedef npy_uint64 __pyx_t_5numpy_uint64_t;
+
+/* "numpy.pxd":737
+ * #ctypedef npy_uint128    uint128_t
+ * 
+ * ctypedef npy_float32    float32_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_float64    float64_t
+ * #ctypedef npy_float80    float80_t
+ */
+typedef npy_float32 __pyx_t_5numpy_float32_t;
+
+/* "numpy.pxd":738
+ * 
+ * ctypedef npy_float32    float32_t
+ * ctypedef npy_float64    float64_t             # <<<<<<<<<<<<<<
+ * #ctypedef npy_float80    float80_t
+ * #ctypedef npy_float128   float128_t
+ */
+typedef npy_float64 __pyx_t_5numpy_float64_t;
+
+/* "numpy.pxd":747
+ * # The int types are mapped a bit surprising --
+ * # numpy.int corresponds to 'l' and numpy.long to 'q'
+ * ctypedef npy_long       int_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_longlong   long_t
+ * ctypedef npy_longlong   longlong_t
+ */
+typedef npy_long __pyx_t_5numpy_int_t;
+
+/* "numpy.pxd":748
+ * # numpy.int corresponds to 'l' and numpy.long to 'q'
+ * ctypedef npy_long       int_t
+ * ctypedef npy_longlong   long_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_longlong   longlong_t
+ * 
+ */
+typedef npy_longlong __pyx_t_5numpy_long_t;
+
+/* "numpy.pxd":749
+ * ctypedef npy_long       int_t
+ * ctypedef npy_longlong   long_t
+ * ctypedef npy_longlong   longlong_t             # <<<<<<<<<<<<<<
+ * 
+ * ctypedef npy_ulong      uint_t
+ */
+typedef npy_longlong __pyx_t_5numpy_longlong_t;
+
+/* "numpy.pxd":751
+ * ctypedef npy_longlong   longlong_t
+ * 
+ * ctypedef npy_ulong      uint_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_ulonglong  ulong_t
+ * ctypedef npy_ulonglong  ulonglong_t
+ */
+typedef npy_ulong __pyx_t_5numpy_uint_t;
+
+/* "numpy.pxd":752
+ * 
+ * ctypedef npy_ulong      uint_t
+ * ctypedef npy_ulonglong  ulong_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_ulonglong  ulonglong_t
+ * 
+ */
+typedef npy_ulonglong __pyx_t_5numpy_ulong_t;
+
+/* "numpy.pxd":753
+ * ctypedef npy_ulong      uint_t
+ * ctypedef npy_ulonglong  ulong_t
+ * ctypedef npy_ulonglong  ulonglong_t             # <<<<<<<<<<<<<<
+ * 
+ * ctypedef npy_intp       intp_t
+ */
+typedef npy_ulonglong __pyx_t_5numpy_ulonglong_t;
+
+/* "numpy.pxd":755
+ * ctypedef npy_ulonglong  ulonglong_t
+ * 
+ * ctypedef npy_intp       intp_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_uintp      uintp_t
+ * 
+ */
+typedef npy_intp __pyx_t_5numpy_intp_t;
+
+/* "numpy.pxd":756
+ * 
+ * ctypedef npy_intp       intp_t
+ * ctypedef npy_uintp      uintp_t             # <<<<<<<<<<<<<<
+ * 
+ * ctypedef npy_double     float_t
+ */
+typedef npy_uintp __pyx_t_5numpy_uintp_t;
+
+/* "numpy.pxd":758
+ * ctypedef npy_uintp      uintp_t
+ * 
+ * ctypedef npy_double     float_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_double     double_t
+ * ctypedef npy_longdouble longdouble_t
+ */
+typedef npy_double __pyx_t_5numpy_float_t;
+
+/* "numpy.pxd":759
+ * 
+ * ctypedef npy_double     float_t
+ * ctypedef npy_double     double_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_longdouble longdouble_t
+ * 
+ */
+typedef npy_double __pyx_t_5numpy_double_t;
+
+/* "numpy.pxd":760
+ * ctypedef npy_double     float_t
+ * ctypedef npy_double     double_t
+ * ctypedef npy_longdouble longdouble_t             # <<<<<<<<<<<<<<
+ * 
+ * ctypedef npy_cfloat      cfloat_t
+ */
+typedef npy_longdouble __pyx_t_5numpy_longdouble_t;
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    typedef ::std::complex< float > __pyx_t_float_complex;
+  #else
+    typedef float _Complex __pyx_t_float_complex;
+  #endif
+#else
+    typedef struct { float real, imag; } __pyx_t_float_complex;
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    typedef ::std::complex< double > __pyx_t_double_complex;
+  #else
+    typedef double _Complex __pyx_t_double_complex;
+  #endif
+#else
+    typedef struct { double real, imag; } __pyx_t_double_complex;
+#endif
+
+
+/*--- Type declarations ---*/
+struct __pyx_obj_8pykdtree_6kdtree_KDTree;
+
+/* "numpy.pxd":762
+ * ctypedef npy_longdouble longdouble_t
+ * 
+ * ctypedef npy_cfloat      cfloat_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_cdouble     cdouble_t
+ * ctypedef npy_clongdouble clongdouble_t
+ */
+typedef npy_cfloat __pyx_t_5numpy_cfloat_t;
+
+/* "numpy.pxd":763
+ * 
+ * ctypedef npy_cfloat      cfloat_t
+ * ctypedef npy_cdouble     cdouble_t             # <<<<<<<<<<<<<<
+ * ctypedef npy_clongdouble clongdouble_t
+ * 
+ */
+typedef npy_cdouble __pyx_t_5numpy_cdouble_t;
+
+/* "numpy.pxd":764
+ * ctypedef npy_cfloat      cfloat_t
+ * ctypedef npy_cdouble     cdouble_t
+ * ctypedef npy_clongdouble clongdouble_t             # <<<<<<<<<<<<<<
+ * 
+ * ctypedef npy_cdouble     complex_t
+ */
+typedef npy_clongdouble __pyx_t_5numpy_clongdouble_t;
+
+/* "numpy.pxd":766
+ * ctypedef npy_clongdouble clongdouble_t
+ * 
+ * ctypedef npy_cdouble     complex_t             # <<<<<<<<<<<<<<
+ * 
+ * cdef inline object PyArray_MultiIterNew1(a):
+ */
+typedef npy_cdouble __pyx_t_5numpy_complex_t;
+struct __pyx_t_8pykdtree_6kdtree_node_float;
+struct __pyx_t_8pykdtree_6kdtree_tree_float;
+struct __pyx_t_8pykdtree_6kdtree_node_double;
+struct __pyx_t_8pykdtree_6kdtree_tree_double;
+
+/* "pykdtree/kdtree.pyx":25
+ * 
+ * # Node structure
+ * cdef struct node_float:             # <<<<<<<<<<<<<<
+ *     float cut_val
+ *     int8_t cut_dim
+ */
+struct __pyx_t_8pykdtree_6kdtree_node_float {
+  float cut_val;
+  int8_t cut_dim;
+  uint32_t start_idx;
+  uint32_t n;
+  float cut_bounds_lv;
+  float cut_bounds_hv;
+  struct __pyx_t_8pykdtree_6kdtree_node_float *left_child;
+  struct __pyx_t_8pykdtree_6kdtree_node_float *right_child;
+};
+
+/* "pykdtree/kdtree.pyx":35
+ *     node_float *right_child
+ * 
+ * cdef struct tree_float:             # <<<<<<<<<<<<<<
+ *     float *bbox
+ *     int8_t no_dims
+ */
+struct __pyx_t_8pykdtree_6kdtree_tree_float {
+  float *bbox;
+  int8_t no_dims;
+  uint32_t *pidx;
+  struct __pyx_t_8pykdtree_6kdtree_node_float *root;
+};
+
+/* "pykdtree/kdtree.pyx":41
+ *     node_float *root
+ * 
+ * cdef struct node_double:             # <<<<<<<<<<<<<<
+ *     double cut_val
+ *     int8_t cut_dim
+ */
+struct __pyx_t_8pykdtree_6kdtree_node_double {
+  double cut_val;
+  int8_t cut_dim;
+  uint32_t start_idx;
+  uint32_t n;
+  double cut_bounds_lv;
+  double cut_bounds_hv;
+  struct __pyx_t_8pykdtree_6kdtree_node_double *left_child;
+  struct __pyx_t_8pykdtree_6kdtree_node_double *right_child;
+};
+
+/* "pykdtree/kdtree.pyx":51
+ *     node_double *right_child
+ * 
+ * cdef struct tree_double:             # <<<<<<<<<<<<<<
+ *     double *bbox
+ *     int8_t no_dims
+ */
+struct __pyx_t_8pykdtree_6kdtree_tree_double {
+  double *bbox;
+  int8_t no_dims;
+  uint32_t *pidx;
+  struct __pyx_t_8pykdtree_6kdtree_node_double *root;
+};
+
+/* "pykdtree/kdtree.pyx":65
+ * cdef extern void delete_tree_double(tree_double *kdtree)
+ * 
+ * cdef class KDTree:             # <<<<<<<<<<<<<<
+ *     """kd-tree for fast nearest-neighbour lookup.
+ *     The interface is made to resemble the scipy.spatial kd-tree except
+ */
+struct __pyx_obj_8pykdtree_6kdtree_KDTree {
+  PyObject_HEAD
+  struct __pyx_t_8pykdtree_6kdtree_tree_float *_kdtree_float;
+  struct __pyx_t_8pykdtree_6kdtree_tree_double *_kdtree_double;
+  PyArrayObject *data_pts;
+  float *_data_pts_data_float;
+  double *_data_pts_data_double;
+  uint32_t n;
+  int8_t ndim;
+  uint32_t leafsize;
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+  #define __Pyx_XDECREF(r)  do { if((r) != NULL) {__Pyx_DECREF(r); }} while(0)
+  #define __Pyx_XGOTREF(r)  do { if((r) != NULL) {__Pyx_GOTREF(r); }} while(0)
+  #define __Pyx_XGIVEREF(r) do { if((r) != NULL) {__Pyx_GIVEREF(r);}} while(0)
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+  #define __Pyx_RefNannySetupContext(name, acquire_gil)
+  #define __Pyx_RefNannyFinishContext()
+  #define __Pyx_INCREF(r) Py_INCREF(r)
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+  #define __Pyx_GOTREF(r)
+  #define __Pyx_GIVEREF(r)
+  #define __Pyx_XINCREF(r) Py_XINCREF(r)
+  #define __Pyx_XDECREF(r) Py_XDECREF(r)
+  #define __Pyx_XGOTREF(r)
+  #define __Pyx_XGIVEREF(r)
+#endif /* CYTHON_REFNANNY */
+#define __Pyx_CLEAR(r)    do { PyObject* tmp = ((PyObject*)(r)); r = NULL; __Pyx_DECREF(tmp);} while(0)
+#define __Pyx_XCLEAR(r)   do { if((r) != NULL) {PyObject* tmp = ((PyObject*)(r)); r = NULL; __Pyx_DECREF(tmp);}} while(0)
+
+static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name); /*proto*/
+
+static void __Pyx_RaiseArgtupleInvalid(const char* func_name, int exact,
+    Py_ssize_t num_min, Py_ssize_t num_max, Py_ssize_t num_found); /*proto*/
+
+static CYTHON_INLINE int __Pyx_CheckKeywordStrings(PyObject *kwdict, const char* function_name, int kw_allowed); /*proto*/
+
+static void __Pyx_RaiseDoubleKeywordsError(const char* func_name, PyObject* kw_name); /*proto*/
+
+static int __Pyx_ParseOptionalKeywords(PyObject *kwds, PyObject **argnames[], \
+    PyObject *kwds2, PyObject *values[], Py_ssize_t num_pos_args, \
+    const char* function_name); /*proto*/
+
+static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
+    const char *name, int exact); /*proto*/
+
+static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
+static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
+
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause); /*proto*/
+
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type); /*proto*/
+
+static CYTHON_INLINE int  __Pyx_GetBufferAndValidate(Py_buffer* buf, PyObject* obj,
+    __Pyx_TypeInfo* dtype, int flags, int nd, int cast, __Pyx_BufFmt_StackElem* stack);
+static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info);
+
+static void __Pyx_RaiseBufferFallbackError(void); /*proto*/
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected);
+
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index);
+
+static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void);
+
+static CYTHON_INLINE int __Pyx_IterFinish(void); /*proto*/
+
+static int __Pyx_IternextUnpackEndCheck(PyObject *retval, Py_ssize_t expected); /*proto*/
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_uint32_t(uint32_t);
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_int8_t(int8_t);
+
+typedef struct {
+  Py_ssize_t shape, strides, suboffsets;
+} __Pyx_Buf_DimInfo;
+typedef struct {
+  size_t refcount;
+  Py_buffer pybuffer;
+} __Pyx_Buffer;
+typedef struct {
+  __Pyx_Buffer *rcbuffer;
+  char *data;
+  __Pyx_Buf_DimInfo diminfo[8];
+} __Pyx_LocalBuf_ND;
+
+#if PY_MAJOR_VERSION < 3
+    static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags);
+    static void __Pyx_ReleaseBuffer(Py_buffer *view);
+#else
+    #define __Pyx_GetBuffer PyObject_GetBuffer
+    #define __Pyx_ReleaseBuffer PyBuffer_Release
+#endif
+
+
+static Py_ssize_t __Pyx_zeros[] = {0, 0, 0, 0, 0, 0, 0, 0};
+static Py_ssize_t __Pyx_minusones[] = {-1, -1, -1, -1, -1, -1, -1, -1};
+
+static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, int level); /*proto*/
+
+#ifndef __PYX_FORCE_INIT_THREADS
+  #define __PYX_FORCE_INIT_THREADS 0
+#endif
+
+static CYTHON_INLINE uint32_t __Pyx_PyInt_from_py_uint32_t(PyObject *);
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    #define __Pyx_CREAL(z) ((z).real())
+    #define __Pyx_CIMAG(z) ((z).imag())
+  #else
+    #define __Pyx_CREAL(z) (__real__(z))
+    #define __Pyx_CIMAG(z) (__imag__(z))
+  #endif
+#else
+    #define __Pyx_CREAL(z) ((z).real)
+    #define __Pyx_CIMAG(z) ((z).imag)
+#endif
+#if defined(_WIN32) && defined(__cplusplus) && CYTHON_CCOMPLEX
+    #define __Pyx_SET_CREAL(z,x) ((z).real(x))
+    #define __Pyx_SET_CIMAG(z,y) ((z).imag(y))
+#else
+    #define __Pyx_SET_CREAL(z,x) __Pyx_CREAL(z) = (x)
+    #define __Pyx_SET_CIMAG(z,y) __Pyx_CIMAG(z) = (y)
+#endif
+
+static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float, float);
+
+#if CYTHON_CCOMPLEX
+    #define __Pyx_c_eqf(a, b)   ((a)==(b))
+    #define __Pyx_c_sumf(a, b)  ((a)+(b))
+    #define __Pyx_c_difff(a, b) ((a)-(b))
+    #define __Pyx_c_prodf(a, b) ((a)*(b))
+    #define __Pyx_c_quotf(a, b) ((a)/(b))
+    #define __Pyx_c_negf(a)     (-(a))
+  #ifdef __cplusplus
+    #define __Pyx_c_is_zerof(z) ((z)==(float)0)
+    #define __Pyx_c_conjf(z)    (::std::conj(z))
+    #if 1
+        #define __Pyx_c_absf(z)     (::std::abs(z))
+        #define __Pyx_c_powf(a, b)  (::std::pow(a, b))
+    #endif
+  #else
+    #define __Pyx_c_is_zerof(z) ((z)==0)
+    #define __Pyx_c_conjf(z)    (conjf(z))
+    #if 1
+        #define __Pyx_c_absf(z)     (cabsf(z))
+        #define __Pyx_c_powf(a, b)  (cpowf(a, b))
+    #endif
+ #endif
+#else
+    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex, __pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex);
+    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex);
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex);
+    #if 1
+        static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex);
+        static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_powf(__pyx_t_float_complex, __pyx_t_float_complex);
+    #endif
+#endif
+
+static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double, double);
+
+#if CYTHON_CCOMPLEX
+    #define __Pyx_c_eq(a, b)   ((a)==(b))
+    #define __Pyx_c_sum(a, b)  ((a)+(b))
+    #define __Pyx_c_diff(a, b) ((a)-(b))
+    #define __Pyx_c_prod(a, b) ((a)*(b))
+    #define __Pyx_c_quot(a, b) ((a)/(b))
+    #define __Pyx_c_neg(a)     (-(a))
+  #ifdef __cplusplus
+    #define __Pyx_c_is_zero(z) ((z)==(double)0)
+    #define __Pyx_c_conj(z)    (::std::conj(z))
+    #if 1
+        #define __Pyx_c_abs(z)     (::std::abs(z))
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+  #define __Pyx_PyIdentifier_FromString(s) PyString_FromString(s)
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+  #define __Pyx_PyIdentifier_FromString(s) PyUnicode_FromString(s)
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+static PyObject *__Pyx_ImportModule(const char *name); /*proto*/
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+static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name, size_t size, int strict);  /*proto*/
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+    int max_count;
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+static void __Pyx_AddTraceback(const char *funcname, int c_line,
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+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
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+
+/* Module declarations from 'libc.stdio' */
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+/* Module declarations from 'cpython.object' */
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+/* Module declarations from '__builtin__' */
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+static PyTypeObject *__pyx_ptype_7cpython_4type_type = 0;
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+
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+static PyObject *__pyx_builtin_TypeError;
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+static PyObject *__pyx_pf_8pykdtree_6kdtree_6KDTree_1n___get__(struct __pyx_obj_8pykdtree_6kdtree_KDTree *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_8pykdtree_6kdtree_6KDTree_4ndim___get__(struct __pyx_obj_8pykdtree_6kdtree_KDTree *__pyx_v_self); /* proto */
+static PyObject *__pyx_pf_8pykdtree_6kdtree_6KDTree_8leafsize___get__(struct __pyx_obj_8pykdtree_6kdtree_KDTree *__pyx_v_self); /* proto */
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+static int __pyx_pf_8pykdtree_6kdtree_6KDTree___cinit__(struct __pyx_obj_8pykdtree_6kdtree_KDTree *__pyx_v_self) {
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+    __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
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+ *             info.buf = PyArray_DATA(self)
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+ *                 # Allocate new buffer for strides and shape info.
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+
+  /* "numpy.pxd":223
+ *             info.buf = PyArray_DATA(self)
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+ *             if copy_shape:             # <<<<<<<<<<<<<<
+ *                 # Allocate new buffer for strides and shape info.
+ *                 # This is allocated as one block, strides first.
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+
+    /* "numpy.pxd":226
+ *                 # Allocate new buffer for strides and shape info.
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+    /* "numpy.pxd":227
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+    /* "numpy.pxd":228
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+ *                 info.shape = info.strides + ndim
+ *                 for i in range(ndim):             # <<<<<<<<<<<<<<
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+      /* "numpy.pxd":229
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+ */
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+ *                 info.shape = <Py_ssize_t*>PyArray_DIMS(self)             # <<<<<<<<<<<<<<
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+ *             info.itemsize = PyArray_ITEMSIZE(self)
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+ *             info.itemsize = PyArray_ITEMSIZE(self)             # <<<<<<<<<<<<<<
+ *             info.readonly = not PyArray_ISWRITEABLE(self)
+ * 
+ */
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+  /* "numpy.pxd":236
+ *             info.suboffsets = NULL
+ *             info.itemsize = PyArray_ITEMSIZE(self)
+ *             info.readonly = not PyArray_ISWRITEABLE(self)             # <<<<<<<<<<<<<<
+ * 
+ *             cdef int t
+ */
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+  /* "numpy.pxd":239
+ * 
+ *             cdef int t
+ *             cdef char* f = NULL             # <<<<<<<<<<<<<<
+ *             cdef dtype descr = self.descr
+ *             cdef list stack
+ */
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+
+  /* "numpy.pxd":240
+ *             cdef int t
+ *             cdef char* f = NULL
+ *             cdef dtype descr = self.descr             # <<<<<<<<<<<<<<
+ *             cdef list stack
+ *             cdef int offset
+ */
+  __pyx_t_4 = ((PyObject *)__pyx_v_self->descr);
+  __Pyx_INCREF(__pyx_t_4);
+  __pyx_v_descr = ((PyArray_Descr *)__pyx_t_4);
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+
+  /* "numpy.pxd":244
+ *             cdef int offset
+ * 
+ *             cdef bint hasfields = PyDataType_HASFIELDS(descr)             # <<<<<<<<<<<<<<
+ * 
+ *             if not hasfields and not copy_shape:
+ */
+  __pyx_v_hasfields = PyDataType_HASFIELDS(__pyx_v_descr);
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+  /* "numpy.pxd":246
+ *             cdef bint hasfields = PyDataType_HASFIELDS(descr)
+ * 
+ *             if not hasfields and not copy_shape:             # <<<<<<<<<<<<<<
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+ *                 info.obj = None
+ */
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+  if (__pyx_t_2) {
+    __pyx_t_3 = (!__pyx_v_copy_shape);
+    __pyx_t_1 = __pyx_t_3;
+  } else {
+    __pyx_t_1 = __pyx_t_2;
+  }
+  if (__pyx_t_1) {
+
+    /* "numpy.pxd":248
+ *             if not hasfields and not copy_shape:
+ *                 # do not call releasebuffer
+ *                 info.obj = None             # <<<<<<<<<<<<<<
+ *             else:
+ *                 # need to call releasebuffer
+ */
+    __Pyx_INCREF(Py_None);
+    __Pyx_GIVEREF(Py_None);
+    __Pyx_GOTREF(__pyx_v_info->obj);
+    __Pyx_DECREF(__pyx_v_info->obj);
+    __pyx_v_info->obj = Py_None;
+    goto __pyx_L10;
+  }
+  /*else*/ {
+
+    /* "numpy.pxd":251
+ *             else:
+ *                 # need to call releasebuffer
+ *                 info.obj = self             # <<<<<<<<<<<<<<
+ * 
+ *             if not hasfields:
+ */
+    __Pyx_INCREF(((PyObject *)__pyx_v_self));
+    __Pyx_GIVEREF(((PyObject *)__pyx_v_self));
+    __Pyx_GOTREF(__pyx_v_info->obj);
+    __Pyx_DECREF(__pyx_v_info->obj);
+    __pyx_v_info->obj = ((PyObject *)__pyx_v_self);
+  }
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+
+  /* "numpy.pxd":253
+ *                 info.obj = self
+ * 
+ *             if not hasfields:             # <<<<<<<<<<<<<<
+ *                 t = descr.type_num
+ *                 if ((descr.byteorder == c'>' and little_endian) or
+ */
+  __pyx_t_1 = (!__pyx_v_hasfields);
+  if (__pyx_t_1) {
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+    /* "numpy.pxd":254
+ * 
+ *             if not hasfields:
+ *                 t = descr.type_num             # <<<<<<<<<<<<<<
+ *                 if ((descr.byteorder == c'>' and little_endian) or
+ *                     (descr.byteorder == c'<' and not little_endian)):
+ */
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+    __pyx_v_t = __pyx_t_5;
+
+    /* "numpy.pxd":255
+ *             if not hasfields:
+ *                 t = descr.type_num
+ *                 if ((descr.byteorder == c'>' and little_endian) or             # <<<<<<<<<<<<<<
+ *                     (descr.byteorder == c'<' and not little_endian)):
+ *                     raise ValueError(u"Non-native byte order not supported")
+ */
+    __pyx_t_1 = (__pyx_v_descr->byteorder == '>');
+    if (__pyx_t_1) {
+      __pyx_t_2 = __pyx_v_little_endian;
+    } else {
+      __pyx_t_2 = __pyx_t_1;
+    }
+    if (!__pyx_t_2) {
+
+      /* "numpy.pxd":256
+ *                 t = descr.type_num
+ *                 if ((descr.byteorder == c'>' and little_endian) or
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+ */
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+      __pyx_t_1 = __pyx_t_7;
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+    if (__pyx_t_1) {
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+      /* "numpy.pxd":257
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+      __Pyx_Raise(__pyx_t_4, 0, 0, 0);
+      __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
+      {__pyx_filename = __pyx_f[1]; __pyx_lineno = 257; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+      goto __pyx_L12;
+    }
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+ *                 elif t == NPY_UBYTE:       f = "B"
+ *                 elif t == NPY_SHORT:       f = "h"
+ */
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+      __pyx_v_f = __pyx_k__b;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":259
+ *                     raise ValueError(u"Non-native byte order not supported")
+ *                 if   t == NPY_BYTE:        f = "b"
+ *                 elif t == NPY_UBYTE:       f = "B"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_SHORT:       f = "h"
+ *                 elif t == NPY_USHORT:      f = "H"
+ */
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+      __pyx_v_f = __pyx_k__B;
+      goto __pyx_L13;
+    }
+
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+ *                 elif t == NPY_UBYTE:       f = "B"
+ *                 elif t == NPY_SHORT:       f = "h"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_USHORT:      f = "H"
+ *                 elif t == NPY_INT:         f = "i"
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+      __pyx_v_f = __pyx_k__h;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":261
+ *                 elif t == NPY_UBYTE:       f = "B"
+ *                 elif t == NPY_SHORT:       f = "h"
+ *                 elif t == NPY_USHORT:      f = "H"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_INT:         f = "i"
+ *                 elif t == NPY_UINT:        f = "I"
+ */
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+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__H;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":262
+ *                 elif t == NPY_SHORT:       f = "h"
+ *                 elif t == NPY_USHORT:      f = "H"
+ *                 elif t == NPY_INT:         f = "i"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_UINT:        f = "I"
+ *                 elif t == NPY_LONG:        f = "l"
+ */
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+      __pyx_v_f = __pyx_k__i;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":263
+ *                 elif t == NPY_USHORT:      f = "H"
+ *                 elif t == NPY_INT:         f = "i"
+ *                 elif t == NPY_UINT:        f = "I"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_LONG:        f = "l"
+ *                 elif t == NPY_ULONG:       f = "L"
+ */
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+      __pyx_v_f = __pyx_k__I;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":264
+ *                 elif t == NPY_INT:         f = "i"
+ *                 elif t == NPY_UINT:        f = "I"
+ *                 elif t == NPY_LONG:        f = "l"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_ULONG:       f = "L"
+ *                 elif t == NPY_LONGLONG:    f = "q"
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+    __pyx_t_1 = (__pyx_v_t == NPY_LONG);
+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__l;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":265
+ *                 elif t == NPY_UINT:        f = "I"
+ *                 elif t == NPY_LONG:        f = "l"
+ *                 elif t == NPY_ULONG:       f = "L"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_LONGLONG:    f = "q"
+ *                 elif t == NPY_ULONGLONG:   f = "Q"
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+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__L;
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+
+    /* "numpy.pxd":266
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+ *                 elif t == NPY_ULONG:       f = "L"
+ *                 elif t == NPY_LONGLONG:    f = "q"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_ULONGLONG:   f = "Q"
+ *                 elif t == NPY_FLOAT:       f = "f"
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+      __pyx_v_f = __pyx_k__q;
+      goto __pyx_L13;
+    }
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+    /* "numpy.pxd":267
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+ *                 elif t == NPY_LONGLONG:    f = "q"
+ *                 elif t == NPY_ULONGLONG:   f = "Q"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_FLOAT:       f = "f"
+ *                 elif t == NPY_DOUBLE:      f = "d"
+ */
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+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__Q;
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+    /* "numpy.pxd":268
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+ *                 elif t == NPY_ULONGLONG:   f = "Q"
+ *                 elif t == NPY_FLOAT:       f = "f"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_DOUBLE:      f = "d"
+ *                 elif t == NPY_LONGDOUBLE:  f = "g"
+ */
+    __pyx_t_1 = (__pyx_v_t == NPY_FLOAT);
+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__f;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":269
+ *                 elif t == NPY_ULONGLONG:   f = "Q"
+ *                 elif t == NPY_FLOAT:       f = "f"
+ *                 elif t == NPY_DOUBLE:      f = "d"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_LONGDOUBLE:  f = "g"
+ *                 elif t == NPY_CFLOAT:      f = "Zf"
+ */
+    __pyx_t_1 = (__pyx_v_t == NPY_DOUBLE);
+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__d;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":270
+ *                 elif t == NPY_FLOAT:       f = "f"
+ *                 elif t == NPY_DOUBLE:      f = "d"
+ *                 elif t == NPY_LONGDOUBLE:  f = "g"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_CFLOAT:      f = "Zf"
+ *                 elif t == NPY_CDOUBLE:     f = "Zd"
+ */
+    __pyx_t_1 = (__pyx_v_t == NPY_LONGDOUBLE);
+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__g;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":271
+ *                 elif t == NPY_DOUBLE:      f = "d"
+ *                 elif t == NPY_LONGDOUBLE:  f = "g"
+ *                 elif t == NPY_CFLOAT:      f = "Zf"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_CDOUBLE:     f = "Zd"
+ *                 elif t == NPY_CLONGDOUBLE: f = "Zg"
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+    __pyx_t_1 = (__pyx_v_t == NPY_CFLOAT);
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+      __pyx_v_f = __pyx_k__Zf;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":272
+ *                 elif t == NPY_LONGDOUBLE:  f = "g"
+ *                 elif t == NPY_CFLOAT:      f = "Zf"
+ *                 elif t == NPY_CDOUBLE:     f = "Zd"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_CLONGDOUBLE: f = "Zg"
+ *                 elif t == NPY_OBJECT:      f = "O"
+ */
+    __pyx_t_1 = (__pyx_v_t == NPY_CDOUBLE);
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+      __pyx_v_f = __pyx_k__Zd;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":273
+ *                 elif t == NPY_CFLOAT:      f = "Zf"
+ *                 elif t == NPY_CDOUBLE:     f = "Zd"
+ *                 elif t == NPY_CLONGDOUBLE: f = "Zg"             # <<<<<<<<<<<<<<
+ *                 elif t == NPY_OBJECT:      f = "O"
+ *                 else:
+ */
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+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__Zg;
+      goto __pyx_L13;
+    }
+
+    /* "numpy.pxd":274
+ *                 elif t == NPY_CDOUBLE:     f = "Zd"
+ *                 elif t == NPY_CLONGDOUBLE: f = "Zg"
+ *                 elif t == NPY_OBJECT:      f = "O"             # <<<<<<<<<<<<<<
+ *                 else:
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+ */
+    __pyx_t_1 = (__pyx_v_t == NPY_OBJECT);
+    if (__pyx_t_1) {
+      __pyx_v_f = __pyx_k__O;
+      goto __pyx_L13;
+    }
+    /*else*/ {
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+      /* "numpy.pxd":276
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+ */
+  __pyx_t_1 = __Pyx_PyBool_FromLong(0); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 129; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(__pyx_t_1);
+  __pyx_k_4 = __pyx_t_1;
+  __Pyx_GIVEREF(__pyx_t_1);
+  __pyx_t_1 = 0;
+
+  /* "pykdtree/kdtree.pyx":1
+ * #pykdtree, Fast kd-tree implementation with OpenMP-enabled queries             # <<<<<<<<<<<<<<
+ * #
+ * #Copyright (C) 2013  Esben S. Nielsen
+ */
+  __pyx_t_1 = PyDict_New(); if (unlikely(!__pyx_t_1)) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_GOTREF(((PyObject *)__pyx_t_1));
+  if (PyObject_SetAttr(__pyx_m, __pyx_n_s____test__, ((PyObject *)__pyx_t_1)) < 0) {__pyx_filename = __pyx_f[0]; __pyx_lineno = 1; __pyx_clineno = __LINE__; goto __pyx_L1_error;}
+  __Pyx_DECREF(((PyObject *)__pyx_t_1)); __pyx_t_1 = 0;
+
+  /* "numpy.pxd":975
+ *      arr.base = baseptr
+ * 
+ * cdef inline object get_array_base(ndarray arr):             # <<<<<<<<<<<<<<
+ *     if arr.base is NULL:
+ *         return None
+ */
+  goto __pyx_L0;
+  __pyx_L1_error:;
+  __Pyx_XDECREF(__pyx_t_1);
+  if (__pyx_m) {
+    __Pyx_AddTraceback("init pykdtree.kdtree", __pyx_clineno, __pyx_lineno, __pyx_filename);
+    Py_DECREF(__pyx_m); __pyx_m = 0;
+  } else if (!PyErr_Occurred()) {
+    PyErr_SetString(PyExc_ImportError, "init pykdtree.kdtree");
+  }
+  __pyx_L0:;
+  __Pyx_RefNannyFinishContext();
+  #if PY_MAJOR_VERSION < 3
+  return;
+  #else
+  return __pyx_m;
+  #endif
+}
+
+/* Runtime support code */
+#if CYTHON_REFNANNY
+static __Pyx_RefNannyAPIStruct *__Pyx_RefNannyImportAPI(const char *modname) {
+    PyObject *m = NULL, *p = NULL;
+    void *r = NULL;
+    m = PyImport_ImportModule((char *)modname);
+    if (!m) goto end;
+    p = PyObject_GetAttrString(m, (char *)"RefNannyAPI");
+    if (!p) goto end;
+    r = PyLong_AsVoidPtr(p);
+end:
+    Py_XDECREF(p);
+    Py_XDECREF(m);
+    return (__Pyx_RefNannyAPIStruct *)r;
+}
+#endif /* CYTHON_REFNANNY */
+
+static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name) {
+    PyObject *result;
+    result = PyObject_GetAttr(dict, name);
+    if (!result) {
+        if (dict != __pyx_b) {
+            PyErr_Clear();
+            result = PyObject_GetAttr(__pyx_b, name);
+        }
+        if (!result) {
+            PyErr_SetObject(PyExc_NameError, name);
+        }
+    }
+    return result;
+}
+
+static void __Pyx_RaiseArgtupleInvalid(
+    const char* func_name,
+    int exact,
+    Py_ssize_t num_min,
+    Py_ssize_t num_max,
+    Py_ssize_t num_found)
+{
+    Py_ssize_t num_expected;
+    const char *more_or_less;
+    if (num_found < num_min) {
+        num_expected = num_min;
+        more_or_less = "at least";
+    } else {
+        num_expected = num_max;
+        more_or_less = "at most";
+    }
+    if (exact) {
+        more_or_less = "exactly";
+    }
+    PyErr_Format(PyExc_TypeError,
+                 "%s() takes %s %" CYTHON_FORMAT_SSIZE_T "d positional argument%s (%" CYTHON_FORMAT_SSIZE_T "d given)",
+                 func_name, more_or_less, num_expected,
+                 (num_expected == 1) ? "" : "s", num_found);
+}
+
+static CYTHON_INLINE int __Pyx_CheckKeywordStrings(
+    PyObject *kwdict,
+    const char* function_name,
+    int kw_allowed)
+{
+    PyObject* key = 0;
+    Py_ssize_t pos = 0;
+#if CPYTHON_COMPILING_IN_PYPY
+    if (!kw_allowed && PyDict_Next(kwdict, &pos, &key, 0))
+        goto invalid_keyword;
+    return 1;
+#else
+    while (PyDict_Next(kwdict, &pos, &key, 0)) {
+        #if PY_MAJOR_VERSION < 3
+        if (unlikely(!PyString_CheckExact(key)) && unlikely(!PyString_Check(key)))
+        #endif
+            if (unlikely(!PyUnicode_Check(key)))
+                goto invalid_keyword_type;
+    }
+    if ((!kw_allowed) && unlikely(key))
+        goto invalid_keyword;
+    return 1;
+invalid_keyword_type:
+    PyErr_Format(PyExc_TypeError,
+        "%s() keywords must be strings", function_name);
+    return 0;
+#endif
+invalid_keyword:
+    PyErr_Format(PyExc_TypeError,
+    #if PY_MAJOR_VERSION < 3
+        "%s() got an unexpected keyword argument '%s'",
+        function_name, PyString_AsString(key));
+    #else
+        "%s() got an unexpected keyword argument '%U'",
+        function_name, key);
+    #endif
+    return 0;
+}
+
+static void __Pyx_RaiseDoubleKeywordsError(
+    const char* func_name,
+    PyObject* kw_name)
+{
+    PyErr_Format(PyExc_TypeError,
+        #if PY_MAJOR_VERSION >= 3
+        "%s() got multiple values for keyword argument '%U'", func_name, kw_name);
+        #else
+        "%s() got multiple values for keyword argument '%s'", func_name,
+        PyString_AsString(kw_name));
+        #endif
+}
+
+static int __Pyx_ParseOptionalKeywords(
+    PyObject *kwds,
+    PyObject **argnames[],
+    PyObject *kwds2,
+    PyObject *values[],
+    Py_ssize_t num_pos_args,
+    const char* function_name)
+{
+    PyObject *key = 0, *value = 0;
+    Py_ssize_t pos = 0;
+    PyObject*** name;
+    PyObject*** first_kw_arg = argnames + num_pos_args;
+    while (PyDict_Next(kwds, &pos, &key, &value)) {
+        name = first_kw_arg;
+        while (*name && (**name != key)) name++;
+        if (*name) {
+            values[name-argnames] = value;
+            continue;
+        }
+        name = first_kw_arg;
+        #if PY_MAJOR_VERSION < 3
+        if (likely(PyString_CheckExact(key)) || likely(PyString_Check(key))) {
+            while (*name) {
+                if ((CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**name) == PyString_GET_SIZE(key))
+                        && _PyString_Eq(**name, key)) {
+                    values[name-argnames] = value;
+                    break;
+                }
+                name++;
+            }
+            if (*name) continue;
+            else {
+                PyObject*** argname = argnames;
+                while (argname != first_kw_arg) {
+                    if ((**argname == key) || (
+                            (CYTHON_COMPILING_IN_PYPY || PyString_GET_SIZE(**argname) == PyString_GET_SIZE(key))
+                             && _PyString_Eq(**argname, key))) {
+                        goto arg_passed_twice;
+                    }
+                    argname++;
+                }
+            }
+        } else
+        #endif
+        if (likely(PyUnicode_Check(key))) {
+            while (*name) {
+                int cmp = (**name == key) ? 0 :
+                #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
+                    (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
+                #endif
+                    PyUnicode_Compare(**name, key);
+                if (cmp < 0 && unlikely(PyErr_Occurred())) goto bad;
+                if (cmp == 0) {
+                    values[name-argnames] = value;
+                    break;
+                }
+                name++;
+            }
+            if (*name) continue;
+            else {
+                PyObject*** argname = argnames;
+                while (argname != first_kw_arg) {
+                    int cmp = (**argname == key) ? 0 :
+                    #if !CYTHON_COMPILING_IN_PYPY && PY_MAJOR_VERSION >= 3
+                        (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
+                    #endif
+                        PyUnicode_Compare(**argname, key);
+                    if (cmp < 0 && unlikely(PyErr_Occurred())) goto bad;
+                    if (cmp == 0) goto arg_passed_twice;
+                    argname++;
+                }
+            }
+        } else
+            goto invalid_keyword_type;
+        if (kwds2) {
+            if (unlikely(PyDict_SetItem(kwds2, key, value))) goto bad;
+        } else {
+            goto invalid_keyword;
+        }
+    }
+    return 0;
+arg_passed_twice:
+    __Pyx_RaiseDoubleKeywordsError(function_name, key);
+    goto bad;
+invalid_keyword_type:
+    PyErr_Format(PyExc_TypeError,
+        "%s() keywords must be strings", function_name);
+    goto bad;
+invalid_keyword:
+    PyErr_Format(PyExc_TypeError,
+    #if PY_MAJOR_VERSION < 3
+        "%s() got an unexpected keyword argument '%s'",
+        function_name, PyString_AsString(key));
+    #else
+        "%s() got an unexpected keyword argument '%U'",
+        function_name, key);
+    #endif
+bad:
+    return -1;
+}
+
+static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed,
+    const char *name, int exact)
+{
+    if (!type) {
+        PyErr_Format(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    if (none_allowed && obj == Py_None) return 1;
+    else if (exact) {
+        if (Py_TYPE(obj) == type) return 1;
+    }
+    else {
+        if (PyObject_TypeCheck(obj, type)) return 1;
+    }
+    PyErr_Format(PyExc_TypeError,
+        "Argument '%s' has incorrect type (expected %s, got %s)",
+        name, type->tp_name, Py_TYPE(obj)->tp_name);
+    return 0;
+}
+
+static CYTHON_INLINE void __Pyx_ErrRestore(PyObject *type, PyObject *value, PyObject *tb) {
+#if CYTHON_COMPILING_IN_CPYTHON
+    PyObject *tmp_type, *tmp_value, *tmp_tb;
+    PyThreadState *tstate = PyThreadState_GET();
+    tmp_type = tstate->curexc_type;
+    tmp_value = tstate->curexc_value;
+    tmp_tb = tstate->curexc_traceback;
+    tstate->curexc_type = type;
+    tstate->curexc_value = value;
+    tstate->curexc_traceback = tb;
+    Py_XDECREF(tmp_type);
+    Py_XDECREF(tmp_value);
+    Py_XDECREF(tmp_tb);
+#else
+    PyErr_Restore(type, value, tb);
+#endif
+}
+static CYTHON_INLINE void __Pyx_ErrFetch(PyObject **type, PyObject **value, PyObject **tb) {
+#if CYTHON_COMPILING_IN_CPYTHON
+    PyThreadState *tstate = PyThreadState_GET();
+    *type = tstate->curexc_type;
+    *value = tstate->curexc_value;
+    *tb = tstate->curexc_traceback;
+    tstate->curexc_type = 0;
+    tstate->curexc_value = 0;
+    tstate->curexc_traceback = 0;
+#else
+    PyErr_Fetch(type, value, tb);
+#endif
+}
+
+#if PY_MAJOR_VERSION < 3
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb,
+                        CYTHON_UNUSED PyObject *cause) {
+    Py_XINCREF(type);
+    if (!value || value == Py_None)
+        value = NULL;
+    else
+        Py_INCREF(value);
+    if (!tb || tb == Py_None)
+        tb = NULL;
+    else {
+        Py_INCREF(tb);
+        if (!PyTraceBack_Check(tb)) {
+            PyErr_SetString(PyExc_TypeError,
+                "raise: arg 3 must be a traceback or None");
+            goto raise_error;
+        }
+    }
+    #if PY_VERSION_HEX < 0x02050000
+    if (PyClass_Check(type)) {
+    #else
+    if (PyType_Check(type)) {
+    #endif
+#if CYTHON_COMPILING_IN_PYPY
+        if (!value) {
+            Py_INCREF(Py_None);
+            value = Py_None;
+        }
+#endif
+        PyErr_NormalizeException(&type, &value, &tb);
+    } else {
+        if (value) {
+            PyErr_SetString(PyExc_TypeError,
+                "instance exception may not have a separate value");
+            goto raise_error;
+        }
+        value = type;
+        #if PY_VERSION_HEX < 0x02050000
+            if (PyInstance_Check(type)) {
+                type = (PyObject*) ((PyInstanceObject*)type)->in_class;
+                Py_INCREF(type);
+            }
+            else {
+                type = 0;
+                PyErr_SetString(PyExc_TypeError,
+                    "raise: exception must be an old-style class or instance");
+                goto raise_error;
+            }
+        #else
+            type = (PyObject*) Py_TYPE(type);
+            Py_INCREF(type);
+            if (!PyType_IsSubtype((PyTypeObject *)type, (PyTypeObject *)PyExc_BaseException)) {
+                PyErr_SetString(PyExc_TypeError,
+                    "raise: exception class must be a subclass of BaseException");
+                goto raise_error;
+            }
+        #endif
+    }
+    __Pyx_ErrRestore(type, value, tb);
+    return;
+raise_error:
+    Py_XDECREF(value);
+    Py_XDECREF(type);
+    Py_XDECREF(tb);
+    return;
+}
+#else /* Python 3+ */
+static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb, PyObject *cause) {
+    PyObject* owned_instance = NULL;
+    if (tb == Py_None) {
+        tb = 0;
+    } else if (tb && !PyTraceBack_Check(tb)) {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: arg 3 must be a traceback or None");
+        goto bad;
+    }
+    if (value == Py_None)
+        value = 0;
+    if (PyExceptionInstance_Check(type)) {
+        if (value) {
+            PyErr_SetString(PyExc_TypeError,
+                "instance exception may not have a separate value");
+            goto bad;
+        }
+        value = type;
+        type = (PyObject*) Py_TYPE(value);
+    } else if (PyExceptionClass_Check(type)) {
+        PyObject *args;
+        if (!value)
+            args = PyTuple_New(0);
+        else if (PyTuple_Check(value)) {
+            Py_INCREF(value);
+            args = value;
+        }
+        else
+            args = PyTuple_Pack(1, value);
+        if (!args)
+            goto bad;
+        owned_instance = PyEval_CallObject(type, args);
+        Py_DECREF(args);
+        if (!owned_instance)
+            goto bad;
+        value = owned_instance;
+        if (!PyExceptionInstance_Check(value)) {
+            PyErr_Format(PyExc_TypeError,
+                         "calling %R should have returned an instance of "
+                         "BaseException, not %R",
+                         type, Py_TYPE(value));
+            goto bad;
+        }
+    } else {
+        PyErr_SetString(PyExc_TypeError,
+            "raise: exception class must be a subclass of BaseException");
+        goto bad;
+    }
+    if (cause && cause != Py_None) {
+        PyObject *fixed_cause;
+        if (PyExceptionClass_Check(cause)) {
+            fixed_cause = PyObject_CallObject(cause, NULL);
+            if (fixed_cause == NULL)
+                goto bad;
+        }
+        else if (PyExceptionInstance_Check(cause)) {
+            fixed_cause = cause;
+            Py_INCREF(fixed_cause);
+        }
+        else {
+            PyErr_SetString(PyExc_TypeError,
+                            "exception causes must derive from "
+                            "BaseException");
+            goto bad;
+        }
+        PyException_SetCause(value, fixed_cause);
+    }
+    PyErr_SetObject(type, value);
+    if (tb) {
+        PyThreadState *tstate = PyThreadState_GET();
+        PyObject* tmp_tb = tstate->curexc_traceback;
+        if (tb != tmp_tb) {
+            Py_INCREF(tb);
+            tstate->curexc_traceback = tb;
+            Py_XDECREF(tmp_tb);
+        }
+    }
+bad:
+    Py_XDECREF(owned_instance);
+    return;
+}
+#endif
+
+static CYTHON_INLINE int __Pyx_TypeTest(PyObject *obj, PyTypeObject *type) {
+    if (unlikely(!type)) {
+        PyErr_Format(PyExc_SystemError, "Missing type object");
+        return 0;
+    }
+    if (likely(PyObject_TypeCheck(obj, type)))
+        return 1;
+    PyErr_Format(PyExc_TypeError, "Cannot convert %.200s to %.200s",
+                 Py_TYPE(obj)->tp_name, type->tp_name);
+    return 0;
+}
+
+static CYTHON_INLINE int __Pyx_IsLittleEndian(void) {
+  unsigned int n = 1;
+  return *(unsigned char*)(&n) != 0;
+}
+static void __Pyx_BufFmt_Init(__Pyx_BufFmt_Context* ctx,
+                              __Pyx_BufFmt_StackElem* stack,
+                              __Pyx_TypeInfo* type) {
+  stack[0].field = &ctx->root;
+  stack[0].parent_offset = 0;
+  ctx->root.type = type;
+  ctx->root.name = "buffer dtype";
+  ctx->root.offset = 0;
+  ctx->head = stack;
+  ctx->head->field = &ctx->root;
+  ctx->fmt_offset = 0;
+  ctx->head->parent_offset = 0;
+  ctx->new_packmode = '@';
+  ctx->enc_packmode = '@';
+  ctx->new_count = 1;
+  ctx->enc_count = 0;
+  ctx->enc_type = 0;
+  ctx->is_complex = 0;
+  ctx->is_valid_array = 0;
+  ctx->struct_alignment = 0;
+  while (type->typegroup == 'S') {
+    ++ctx->head;
+    ctx->head->field = type->fields;
+    ctx->head->parent_offset = 0;
+    type = type->fields->type;
+  }
+}
+static int __Pyx_BufFmt_ParseNumber(const char** ts) {
+    int count;
+    const char* t = *ts;
+    if (*t < '0' || *t > '9') {
+      return -1;
+    } else {
+        count = *t++ - '0';
+        while (*t >= '0' && *t < '9') {
+            count *= 10;
+            count += *t++ - '0';
+        }
+    }
+    *ts = t;
+    return count;
+}
+static int __Pyx_BufFmt_ExpectNumber(const char **ts) {
+    int number = __Pyx_BufFmt_ParseNumber(ts);
+    if (number == -1) /* First char was not a digit */
+        PyErr_Format(PyExc_ValueError,\
+                     "Does not understand character buffer dtype format string ('%c')", **ts);
+    return number;
+}
+static void __Pyx_BufFmt_RaiseUnexpectedChar(char ch) {
+  PyErr_Format(PyExc_ValueError,
+               "Unexpected format string character: '%c'", ch);
+}
+static const char* __Pyx_BufFmt_DescribeTypeChar(char ch, int is_complex) {
+  switch (ch) {
+    case 'c': return "'char'";
+    case 'b': return "'signed char'";
+    case 'B': return "'unsigned char'";
+    case 'h': return "'short'";
+    case 'H': return "'unsigned short'";
+    case 'i': return "'int'";
+    case 'I': return "'unsigned int'";
+    case 'l': return "'long'";
+    case 'L': return "'unsigned long'";
+    case 'q': return "'long long'";
+    case 'Q': return "'unsigned long long'";
+    case 'f': return (is_complex ? "'complex float'" : "'float'");
+    case 'd': return (is_complex ? "'complex double'" : "'double'");
+    case 'g': return (is_complex ? "'complex long double'" : "'long double'");
+    case 'T': return "a struct";
+    case 'O': return "Python object";
+    case 'P': return "a pointer";
+    case 's': case 'p': return "a string";
+    case 0: return "end";
+    default: return "unparseable format string";
+  }
+}
+static size_t __Pyx_BufFmt_TypeCharToStandardSize(char ch, int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': case 's': case 'p': return 1;
+    case 'h': case 'H': return 2;
+    case 'i': case 'I': case 'l': case 'L': return 4;
+    case 'q': case 'Q': return 8;
+    case 'f': return (is_complex ? 8 : 4);
+    case 'd': return (is_complex ? 16 : 8);
+    case 'g': {
+      PyErr_SetString(PyExc_ValueError, "Python does not define a standard format string size for long double ('g')..");
+      return 0;
+    }
+    case 'O': case 'P': return sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+static size_t __Pyx_BufFmt_TypeCharToNativeSize(char ch, int is_complex) {
+  switch (ch) {
+    case 'c': case 'b': case 'B': case 's': case 'p': return 1;
+    case 'h': case 'H': return sizeof(short);
+    case 'i': case 'I': return sizeof(int);
+    case 'l': case 'L': return sizeof(long);
+    #ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(PY_LONG_LONG);
+    #endif
+    case 'f': return sizeof(float) * (is_complex ? 2 : 1);
+    case 'd': return sizeof(double) * (is_complex ? 2 : 1);
+    case 'g': return sizeof(long double) * (is_complex ? 2 : 1);
+    case 'O': case 'P': return sizeof(void*);
+    default: {
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+  }
+}
+typedef struct { char c; short x; } __Pyx_st_short;
+typedef struct { char c; int x; } __Pyx_st_int;
+typedef struct { char c; long x; } __Pyx_st_long;
+typedef struct { char c; float x; } __Pyx_st_float;
+typedef struct { char c; double x; } __Pyx_st_double;
+typedef struct { char c; long double x; } __Pyx_st_longdouble;
+typedef struct { char c; void *x; } __Pyx_st_void_p;
+#ifdef HAVE_LONG_LONG
+typedef struct { char c; PY_LONG_LONG x; } __Pyx_st_longlong;
+#endif
+static size_t __Pyx_BufFmt_TypeCharToAlignment(char ch, CYTHON_UNUSED int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': case 's': case 'p': return 1;
+    case 'h': case 'H': return sizeof(__Pyx_st_short) - sizeof(short);
+    case 'i': case 'I': return sizeof(__Pyx_st_int) - sizeof(int);
+    case 'l': case 'L': return sizeof(__Pyx_st_long) - sizeof(long);
+#ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(__Pyx_st_longlong) - sizeof(PY_LONG_LONG);
+#endif
+    case 'f': return sizeof(__Pyx_st_float) - sizeof(float);
+    case 'd': return sizeof(__Pyx_st_double) - sizeof(double);
+    case 'g': return sizeof(__Pyx_st_longdouble) - sizeof(long double);
+    case 'P': case 'O': return sizeof(__Pyx_st_void_p) - sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+/* These are for computing the padding at the end of the struct to align
+   on the first member of the struct. This will probably the same as above,
+   but we don't have any guarantees.
+ */
+typedef struct { short x; char c; } __Pyx_pad_short;
+typedef struct { int x; char c; } __Pyx_pad_int;
+typedef struct { long x; char c; } __Pyx_pad_long;
+typedef struct { float x; char c; } __Pyx_pad_float;
+typedef struct { double x; char c; } __Pyx_pad_double;
+typedef struct { long double x; char c; } __Pyx_pad_longdouble;
+typedef struct { void *x; char c; } __Pyx_pad_void_p;
+#ifdef HAVE_LONG_LONG
+typedef struct { PY_LONG_LONG x; char c; } __Pyx_pad_longlong;
+#endif
+static size_t __Pyx_BufFmt_TypeCharToPadding(char ch, CYTHON_UNUSED int is_complex) {
+  switch (ch) {
+    case '?': case 'c': case 'b': case 'B': case 's': case 'p': return 1;
+    case 'h': case 'H': return sizeof(__Pyx_pad_short) - sizeof(short);
+    case 'i': case 'I': return sizeof(__Pyx_pad_int) - sizeof(int);
+    case 'l': case 'L': return sizeof(__Pyx_pad_long) - sizeof(long);
+#ifdef HAVE_LONG_LONG
+    case 'q': case 'Q': return sizeof(__Pyx_pad_longlong) - sizeof(PY_LONG_LONG);
+#endif
+    case 'f': return sizeof(__Pyx_pad_float) - sizeof(float);
+    case 'd': return sizeof(__Pyx_pad_double) - sizeof(double);
+    case 'g': return sizeof(__Pyx_pad_longdouble) - sizeof(long double);
+    case 'P': case 'O': return sizeof(__Pyx_pad_void_p) - sizeof(void*);
+    default:
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+}
+static char __Pyx_BufFmt_TypeCharToGroup(char ch, int is_complex) {
+  switch (ch) {
+    case 'c':
+        return 'H';
+    case 'b': case 'h': case 'i':
+    case 'l': case 'q': case 's': case 'p':
+        return 'I';
+    case 'B': case 'H': case 'I': case 'L': case 'Q':
+        return 'U';
+    case 'f': case 'd': case 'g':
+        return (is_complex ? 'C' : 'R');
+    case 'O':
+        return 'O';
+    case 'P':
+        return 'P';
+    default: {
+      __Pyx_BufFmt_RaiseUnexpectedChar(ch);
+      return 0;
+    }
+  }
+}
+static void __Pyx_BufFmt_RaiseExpected(__Pyx_BufFmt_Context* ctx) {
+  if (ctx->head == NULL || ctx->head->field == &ctx->root) {
+    const char* expected;
+    const char* quote;
+    if (ctx->head == NULL) {
+      expected = "end";
+      quote = "";
+    } else {
+      expected = ctx->head->field->type->name;
+      quote = "'";
+    }
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer dtype mismatch, expected %s%s%s but got %s",
+                 quote, expected, quote,
+                 __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex));
+  } else {
+    __Pyx_StructField* field = ctx->head->field;
+    __Pyx_StructField* parent = (ctx->head - 1)->field;
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer dtype mismatch, expected '%s' but got %s in '%s.%s'",
+                 field->type->name, __Pyx_BufFmt_DescribeTypeChar(ctx->enc_type, ctx->is_complex),
+                 parent->type->name, field->name);
+  }
+}
+static int __Pyx_BufFmt_ProcessTypeChunk(__Pyx_BufFmt_Context* ctx) {
+  char group;
+  size_t size, offset, arraysize = 1;
+  if (ctx->enc_type == 0) return 0;
+  if (ctx->head->field->type->arraysize[0]) {
+    int i, ndim = 0;
+    if (ctx->enc_type == 's' || ctx->enc_type == 'p') {
+        ctx->is_valid_array = ctx->head->field->type->ndim == 1;
+        ndim = 1;
+        if (ctx->enc_count != ctx->head->field->type->arraysize[0]) {
+            PyErr_Format(PyExc_ValueError,
+                         "Expected a dimension of size %zu, got %zu",
+                         ctx->head->field->type->arraysize[0], ctx->enc_count);
+            return -1;
+        }
+    }
+    if (!ctx->is_valid_array) {
+      PyErr_Format(PyExc_ValueError, "Expected %d dimensions, got %d",
+                   ctx->head->field->type->ndim, ndim);
+      return -1;
+    }
+    for (i = 0; i < ctx->head->field->type->ndim; i++) {
+      arraysize *= ctx->head->field->type->arraysize[i];
+    }
+    ctx->is_valid_array = 0;
+    ctx->enc_count = 1;
+  }
+  group = __Pyx_BufFmt_TypeCharToGroup(ctx->enc_type, ctx->is_complex);
+  do {
+    __Pyx_StructField* field = ctx->head->field;
+    __Pyx_TypeInfo* type = field->type;
+    if (ctx->enc_packmode == '@' || ctx->enc_packmode == '^') {
+      size = __Pyx_BufFmt_TypeCharToNativeSize(ctx->enc_type, ctx->is_complex);
+    } else {
+      size = __Pyx_BufFmt_TypeCharToStandardSize(ctx->enc_type, ctx->is_complex);
+    }
+    if (ctx->enc_packmode == '@') {
+      size_t align_at = __Pyx_BufFmt_TypeCharToAlignment(ctx->enc_type, ctx->is_complex);
+      size_t align_mod_offset;
+      if (align_at == 0) return -1;
+      align_mod_offset = ctx->fmt_offset % align_at;
+      if (align_mod_offset > 0) ctx->fmt_offset += align_at - align_mod_offset;
+      if (ctx->struct_alignment == 0)
+          ctx->struct_alignment = __Pyx_BufFmt_TypeCharToPadding(ctx->enc_type,
+                                                                 ctx->is_complex);
+    }
+    if (type->size != size || type->typegroup != group) {
+      if (type->typegroup == 'C' && type->fields != NULL) {
+        size_t parent_offset = ctx->head->parent_offset + field->offset;
+        ++ctx->head;
+        ctx->head->field = type->fields;
+        ctx->head->parent_offset = parent_offset;
+        continue;
+      }
+      if ((type->typegroup == 'H' || group == 'H') && type->size == size) {
+      } else {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return -1;
+      }
+    }
+    offset = ctx->head->parent_offset + field->offset;
+    if (ctx->fmt_offset != offset) {
+      PyErr_Format(PyExc_ValueError,
+                   "Buffer dtype mismatch; next field is at offset %" CYTHON_FORMAT_SSIZE_T "d but %" CYTHON_FORMAT_SSIZE_T "d expected",
+                   (Py_ssize_t)ctx->fmt_offset, (Py_ssize_t)offset);
+      return -1;
+    }
+    ctx->fmt_offset += size;
+    if (arraysize)
+      ctx->fmt_offset += (arraysize - 1) * size;
+    --ctx->enc_count; /* Consume from buffer string */
+    while (1) {
+      if (field == &ctx->root) {
+        ctx->head = NULL;
+        if (ctx->enc_count != 0) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return -1;
+        }
+        break; /* breaks both loops as ctx->enc_count == 0 */
+      }
+      ctx->head->field = ++field;
+      if (field->type == NULL) {
+        --ctx->head;
+        field = ctx->head->field;
+        continue;
+      } else if (field->type->typegroup == 'S') {
+        size_t parent_offset = ctx->head->parent_offset + field->offset;
+        if (field->type->fields->type == NULL) continue; /* empty struct */
+        field = field->type->fields;
+        ++ctx->head;
+        ctx->head->field = field;
+        ctx->head->parent_offset = parent_offset;
+        break;
+      } else {
+        break;
+      }
+    }
+  } while (ctx->enc_count);
+  ctx->enc_type = 0;
+  ctx->is_complex = 0;
+  return 0;
+}
+static CYTHON_INLINE PyObject *
+__pyx_buffmt_parse_array(__Pyx_BufFmt_Context* ctx, const char** tsp)
+{
+    const char *ts = *tsp;
+    int i = 0, number;
+    int ndim = ctx->head->field->type->ndim;
+;
+    ++ts;
+    if (ctx->new_count != 1) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Cannot handle repeated arrays in format string");
+        return NULL;
+    }
+    if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+    while (*ts && *ts != ')') {
+        if (isspace(*ts))
+            continue;
+        number = __Pyx_BufFmt_ExpectNumber(&ts);
+        if (number == -1) return NULL;
+        if (i < ndim && (size_t) number != ctx->head->field->type->arraysize[i])
+            return PyErr_Format(PyExc_ValueError,
+                        "Expected a dimension of size %zu, got %d",
+                        ctx->head->field->type->arraysize[i], number);
+        if (*ts != ',' && *ts != ')')
+            return PyErr_Format(PyExc_ValueError,
+                                "Expected a comma in format string, got '%c'", *ts);
+        if (*ts == ',') ts++;
+        i++;
+    }
+    if (i != ndim)
+        return PyErr_Format(PyExc_ValueError, "Expected %d dimension(s), got %d",
+                            ctx->head->field->type->ndim, i);
+    if (!*ts) {
+        PyErr_SetString(PyExc_ValueError,
+                        "Unexpected end of format string, expected ')'");
+        return NULL;
+    }
+    ctx->is_valid_array = 1;
+    ctx->new_count = 1;
+    *tsp = ++ts;
+    return Py_None;
+}
+static const char* __Pyx_BufFmt_CheckString(__Pyx_BufFmt_Context* ctx, const char* ts) {
+  int got_Z = 0;
+  while (1) {
+    switch(*ts) {
+      case 0:
+        if (ctx->enc_type != 0 && ctx->head == NULL) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return NULL;
+        }
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        if (ctx->head != NULL) {
+          __Pyx_BufFmt_RaiseExpected(ctx);
+          return NULL;
+        }
+                return ts;
+      case ' ':
+      case 10:
+      case 13:
+        ++ts;
+        break;
+      case '<':
+        if (!__Pyx_IsLittleEndian()) {
+          PyErr_SetString(PyExc_ValueError, "Little-endian buffer not supported on big-endian compiler");
+          return NULL;
+        }
+        ctx->new_packmode = '=';
+        ++ts;
+        break;
+      case '>':
+      case '!':
+        if (__Pyx_IsLittleEndian()) {
+          PyErr_SetString(PyExc_ValueError, "Big-endian buffer not supported on little-endian compiler");
+          return NULL;
+        }
+        ctx->new_packmode = '=';
+        ++ts;
+        break;
+      case '=':
+      case '@':
+      case '^':
+        ctx->new_packmode = *ts++;
+        break;
+      case 'T': /* substruct */
+        {
+          const char* ts_after_sub;
+          size_t i, struct_count = ctx->new_count;
+          size_t struct_alignment = ctx->struct_alignment;
+          ctx->new_count = 1;
+          ++ts;
+          if (*ts != '{') {
+            PyErr_SetString(PyExc_ValueError, "Buffer acquisition: Expected '{' after 'T'");
+            return NULL;
+          }
+          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+          ctx->enc_type = 0; /* Erase processed last struct element */
+          ctx->enc_count = 0;
+          ctx->struct_alignment = 0;
+          ++ts;
+          ts_after_sub = ts;
+          for (i = 0; i != struct_count; ++i) {
+            ts_after_sub = __Pyx_BufFmt_CheckString(ctx, ts);
+            if (!ts_after_sub) return NULL;
+          }
+          ts = ts_after_sub;
+          if (struct_alignment) ctx->struct_alignment = struct_alignment;
+        }
+        break;
+      case '}': /* end of substruct; either repeat or move on */
+        {
+          size_t alignment = ctx->struct_alignment;
+          ++ts;
+          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+          ctx->enc_type = 0; /* Erase processed last struct element */
+          if (alignment && ctx->fmt_offset % alignment) {
+            ctx->fmt_offset += alignment - (ctx->fmt_offset % alignment);
+          }
+        }
+        return ts;
+      case 'x':
+        if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+        ctx->fmt_offset += ctx->new_count;
+        ctx->new_count = 1;
+        ctx->enc_count = 0;
+        ctx->enc_type = 0;
+        ctx->enc_packmode = ctx->new_packmode;
+        ++ts;
+        break;
+      case 'Z':
+        got_Z = 1;
+        ++ts;
+        if (*ts != 'f' && *ts != 'd' && *ts != 'g') {
+          __Pyx_BufFmt_RaiseUnexpectedChar('Z');
+          return NULL;
+        }        /* fall through */
+      case 'c': case 'b': case 'B': case 'h': case 'H': case 'i': case 'I':
+      case 'l': case 'L': case 'q': case 'Q':
+      case 'f': case 'd': case 'g':
+      case 'O': case 's': case 'p':
+        if (ctx->enc_type == *ts && got_Z == ctx->is_complex &&
+            ctx->enc_packmode == ctx->new_packmode) {
+          ctx->enc_count += ctx->new_count;
+        } else {
+          if (__Pyx_BufFmt_ProcessTypeChunk(ctx) == -1) return NULL;
+          ctx->enc_count = ctx->new_count;
+          ctx->enc_packmode = ctx->new_packmode;
+          ctx->enc_type = *ts;
+          ctx->is_complex = got_Z;
+        }
+        ++ts;
+        ctx->new_count = 1;
+        got_Z = 0;
+        break;
+      case ':':
+        ++ts;
+        while(*ts != ':') ++ts;
+        ++ts;
+        break;
+      case '(':
+        if (!__pyx_buffmt_parse_array(ctx, &ts)) return NULL;
+        break;
+      default:
+        {
+          int number = __Pyx_BufFmt_ExpectNumber(&ts);
+          if (number == -1) return NULL;
+          ctx->new_count = (size_t)number;
+        }
+    }
+  }
+}
+static CYTHON_INLINE void __Pyx_ZeroBuffer(Py_buffer* buf) {
+  buf->buf = NULL;
+  buf->obj = NULL;
+  buf->strides = __Pyx_zeros;
+  buf->shape = __Pyx_zeros;
+  buf->suboffsets = __Pyx_minusones;
+}
+static CYTHON_INLINE int __Pyx_GetBufferAndValidate(
+        Py_buffer* buf, PyObject* obj,  __Pyx_TypeInfo* dtype, int flags,
+        int nd, int cast, __Pyx_BufFmt_StackElem* stack)
+{
+  if (obj == Py_None || obj == NULL) {
+    __Pyx_ZeroBuffer(buf);
+    return 0;
+  }
+  buf->buf = NULL;
+  if (__Pyx_GetBuffer(obj, buf, flags) == -1) goto fail;
+  if (buf->ndim != nd) {
+    PyErr_Format(PyExc_ValueError,
+                 "Buffer has wrong number of dimensions (expected %d, got %d)",
+                 nd, buf->ndim);
+    goto fail;
+  }
+  if (!cast) {
+    __Pyx_BufFmt_Context ctx;
+    __Pyx_BufFmt_Init(&ctx, stack, dtype);
+    if (!__Pyx_BufFmt_CheckString(&ctx, buf->format)) goto fail;
+  }
+  if ((unsigned)buf->itemsize != dtype->size) {
+    PyErr_Format(PyExc_ValueError,
+      "Item size of buffer (%" CYTHON_FORMAT_SSIZE_T "d byte%s) does not match size of '%s' (%" CYTHON_FORMAT_SSIZE_T "d byte%s)",
+      buf->itemsize, (buf->itemsize > 1) ? "s" : "",
+      dtype->name, (Py_ssize_t)dtype->size, (dtype->size > 1) ? "s" : "");
+    goto fail;
+  }
+  if (buf->suboffsets == NULL) buf->suboffsets = __Pyx_minusones;
+  return 0;
+fail:;
+  __Pyx_ZeroBuffer(buf);
+  return -1;
+}
+static CYTHON_INLINE void __Pyx_SafeReleaseBuffer(Py_buffer* info) {
+  if (info->buf == NULL) return;
+  if (info->suboffsets == __Pyx_minusones) info->suboffsets = NULL;
+  __Pyx_ReleaseBuffer(info);
+}
+
+static void __Pyx_RaiseBufferFallbackError(void) {
+  PyErr_Format(PyExc_ValueError,
+     "Buffer acquisition failed on assignment; and then reacquiring the old buffer failed too!");
+}
+
+static CYTHON_INLINE void __Pyx_RaiseTooManyValuesError(Py_ssize_t expected) {
+    PyErr_Format(PyExc_ValueError,
+                 "too many values to unpack (expected %" CYTHON_FORMAT_SSIZE_T "d)", expected);
+}
+
+static CYTHON_INLINE void __Pyx_RaiseNeedMoreValuesError(Py_ssize_t index) {
+    PyErr_Format(PyExc_ValueError,
+                 "need more than %" CYTHON_FORMAT_SSIZE_T "d value%s to unpack",
+                 index, (index == 1) ? "" : "s");
+}
+
+static CYTHON_INLINE void __Pyx_RaiseNoneNotIterableError(void) {
+    PyErr_SetString(PyExc_TypeError, "'NoneType' object is not iterable");
+}
+
+static CYTHON_INLINE int __Pyx_IterFinish(void) {
+#if CYTHON_COMPILING_IN_CPYTHON
+    PyThreadState *tstate = PyThreadState_GET();
+    PyObject* exc_type = tstate->curexc_type;
+    if (unlikely(exc_type)) {
+        if (likely(exc_type == PyExc_StopIteration) || PyErr_GivenExceptionMatches(exc_type, PyExc_StopIteration)) {
+            PyObject *exc_value, *exc_tb;
+            exc_value = tstate->curexc_value;
+            exc_tb = tstate->curexc_traceback;
+            tstate->curexc_type = 0;
+            tstate->curexc_value = 0;
+            tstate->curexc_traceback = 0;
+            Py_DECREF(exc_type);
+            Py_XDECREF(exc_value);
+            Py_XDECREF(exc_tb);
+            return 0;
+        } else {
+            return -1;
+        }
+    }
+    return 0;
+#else
+    if (unlikely(PyErr_Occurred())) {
+        if (likely(PyErr_ExceptionMatches(PyExc_StopIteration))) {
+            PyErr_Clear();
+            return 0;
+        } else {
+            return -1;
+        }
+    }
+    return 0;
+#endif
+}
+
+static int __Pyx_IternextUnpackEndCheck(PyObject *retval, Py_ssize_t expected) {
+    if (unlikely(retval)) {
+        Py_DECREF(retval);
+        __Pyx_RaiseTooManyValuesError(expected);
+        return -1;
+    } else {
+        return __Pyx_IterFinish();
+    }
+    return 0;
+}
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_uint32_t(uint32_t val) {
+    const uint32_t neg_one = (uint32_t)-1, const_zero = (uint32_t)0;
+    const int is_unsigned = const_zero < neg_one;
+    if ((sizeof(uint32_t) == sizeof(char))  ||
+        (sizeof(uint32_t) == sizeof(short))) {
+        return PyInt_FromLong((long)val);
+    } else if ((sizeof(uint32_t) == sizeof(int)) ||
+               (sizeof(uint32_t) == sizeof(long))) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLong((unsigned long)val);
+        else
+            return PyInt_FromLong((long)val);
+    } else if (sizeof(uint32_t) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
+        else
+            return PyLong_FromLongLong((PY_LONG_LONG)val);
+    } else {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&val;
+        return _PyLong_FromByteArray(bytes, sizeof(uint32_t),
+                                     little, !is_unsigned);
+    }
+}
+
+static CYTHON_INLINE PyObject *__Pyx_PyInt_to_py_int8_t(int8_t val) {
+    const int8_t neg_one = (int8_t)-1, const_zero = (int8_t)0;
+    const int is_unsigned = const_zero < neg_one;
+    if ((sizeof(int8_t) == sizeof(char))  ||
+        (sizeof(int8_t) == sizeof(short))) {
+        return PyInt_FromLong((long)val);
+    } else if ((sizeof(int8_t) == sizeof(int)) ||
+               (sizeof(int8_t) == sizeof(long))) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLong((unsigned long)val);
+        else
+            return PyInt_FromLong((long)val);
+    } else if (sizeof(int8_t) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return PyLong_FromUnsignedLongLong((unsigned PY_LONG_LONG)val);
+        else
+            return PyLong_FromLongLong((PY_LONG_LONG)val);
+    } else {
+        int one = 1; int little = (int)*(unsigned char *)&one;
+        unsigned char *bytes = (unsigned char *)&val;
+        return _PyLong_FromByteArray(bytes, sizeof(int8_t),
+                                     little, !is_unsigned);
+    }
+}
+
+#if PY_MAJOR_VERSION < 3
+static int __Pyx_GetBuffer(PyObject *obj, Py_buffer *view, int flags) {
+    CYTHON_UNUSED PyObject *getbuffer_cobj;
+  #if PY_VERSION_HEX >= 0x02060000
+    if (PyObject_CheckBuffer(obj)) return PyObject_GetBuffer(obj, view, flags);
+  #endif
+        if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) return __pyx_pw_5numpy_7ndarray_1__getbuffer__(obj, view, flags);
+  #if PY_VERSION_HEX < 0x02060000
+    if (obj->ob_type->tp_dict &&
+        (getbuffer_cobj = PyMapping_GetItemString(obj->ob_type->tp_dict,
+                                             "__pyx_getbuffer"))) {
+        getbufferproc func;
+      #if PY_VERSION_HEX >= 0x02070000 && !(PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION == 0)
+        func = (getbufferproc) PyCapsule_GetPointer(getbuffer_cobj, "getbuffer(obj, view, flags)");
+      #else
+        func = (getbufferproc) PyCObject_AsVoidPtr(getbuffer_cobj);
+      #endif
+        Py_DECREF(getbuffer_cobj);
+        if (!func)
+            goto fail;
+        return func(obj, view, flags);
+    } else {
+        PyErr_Clear();
+    }
+  #endif
+    PyErr_Format(PyExc_TypeError, "'%100s' does not have the buffer interface", Py_TYPE(obj)->tp_name);
+#if PY_VERSION_HEX < 0x02060000
+fail:
+#endif
+    return -1;
+}
+static void __Pyx_ReleaseBuffer(Py_buffer *view) {
+    PyObject *obj = view->obj;
+    CYTHON_UNUSED PyObject *releasebuffer_cobj;
+    if (!obj) return;
+  #if PY_VERSION_HEX >= 0x02060000
+    if (PyObject_CheckBuffer(obj)) {
+        PyBuffer_Release(view);
+        return;
+    }
+  #endif
+        if (PyObject_TypeCheck(obj, __pyx_ptype_5numpy_ndarray)) { __pyx_pw_5numpy_7ndarray_3__releasebuffer__(obj, view); return; }
+  #if PY_VERSION_HEX < 0x02060000
+    if (obj->ob_type->tp_dict &&
+        (releasebuffer_cobj = PyMapping_GetItemString(obj->ob_type->tp_dict,
+                                                      "__pyx_releasebuffer"))) {
+        releasebufferproc func;
+      #if PY_VERSION_HEX >= 0x02070000 && !(PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION == 0)
+        func = (releasebufferproc) PyCapsule_GetPointer(releasebuffer_cobj, "releasebuffer(obj, view)");
+      #else
+        func = (releasebufferproc) PyCObject_AsVoidPtr(releasebuffer_cobj);
+      #endif
+        Py_DECREF(releasebuffer_cobj);
+        if (!func)
+            goto fail;
+        func(obj, view);
+        return;
+    } else {
+        PyErr_Clear();
+    }
+  #endif
+    goto nofail;
+#if PY_VERSION_HEX < 0x02060000
+fail:
+#endif
+    PyErr_WriteUnraisable(obj);
+nofail:
+    Py_DECREF(obj);
+    view->obj = NULL;
+}
+#endif /*  PY_MAJOR_VERSION < 3 */
+
+
+    static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, int level) {
+    PyObject *empty_list = 0;
+    PyObject *module = 0;
+    PyObject *global_dict = 0;
+    PyObject *empty_dict = 0;
+    PyObject *list;
+    #if PY_VERSION_HEX < 0x03030000
+    PyObject *py_import = 0;
+    py_import = __Pyx_GetAttrString(__pyx_b, "__import__");
+    if (!py_import)
+        goto bad;
+    #endif
+    if (from_list)
+        list = from_list;
+    else {
+        empty_list = PyList_New(0);
+        if (!empty_list)
+            goto bad;
+        list = empty_list;
+    }
+    global_dict = PyModule_GetDict(__pyx_m);
+    if (!global_dict)
+        goto bad;
+    empty_dict = PyDict_New();
+    if (!empty_dict)
+        goto bad;
+    #if PY_VERSION_HEX >= 0x02050000
+    {
+        #if PY_MAJOR_VERSION >= 3
+        if (level == -1) {
+            if (strchr(__Pyx_MODULE_NAME, '.')) {
+                #if PY_VERSION_HEX < 0x03030000
+                PyObject *py_level = PyInt_FromLong(1);
+                if (!py_level)
+                    goto bad;
+                module = PyObject_CallFunctionObjArgs(py_import,
+                    name, global_dict, empty_dict, list, py_level, NULL);
+                Py_DECREF(py_level);
+                #else
+                module = PyImport_ImportModuleLevelObject(
+                    name, global_dict, empty_dict, list, 1);
+                #endif
+                if (!module) {
+                    if (!PyErr_ExceptionMatches(PyExc_ImportError))
+                        goto bad;
+                    PyErr_Clear();
+                }
+            }
+            level = 0; /* try absolute import on failure */
+        }
+        #endif
+        if (!module) {
+            #if PY_VERSION_HEX < 0x03030000
+            PyObject *py_level = PyInt_FromLong(level);
+            if (!py_level)
+                goto bad;
+            module = PyObject_CallFunctionObjArgs(py_import,
+                name, global_dict, empty_dict, list, py_level, NULL);
+            Py_DECREF(py_level);
+            #else
+            module = PyImport_ImportModuleLevelObject(
+                name, global_dict, empty_dict, list, level);
+            #endif
+        }
+    }
+    #else
+    if (level>0) {
+        PyErr_SetString(PyExc_RuntimeError, "Relative import is not supported for Python <=2.4.");
+        goto bad;
+    }
+    module = PyObject_CallFunctionObjArgs(py_import,
+        name, global_dict, empty_dict, list, NULL);
+    #endif
+bad:
+    #if PY_VERSION_HEX < 0x03030000
+    Py_XDECREF(py_import);
+    #endif
+    Py_XDECREF(empty_list);
+    Py_XDECREF(empty_dict);
+    return module;
+}
+
+static CYTHON_INLINE uint32_t __Pyx_PyInt_from_py_uint32_t(PyObject* x) {
+    const uint32_t neg_one = (uint32_t)-1, const_zero = (uint32_t)0;
+    const int is_unsigned = const_zero < neg_one;
+    if (sizeof(uint32_t) == sizeof(char)) {
+        if (is_unsigned)
+            return (uint32_t)__Pyx_PyInt_AsUnsignedChar(x);
+        else
+            return (uint32_t)__Pyx_PyInt_AsSignedChar(x);
+    } else if (sizeof(uint32_t) == sizeof(short)) {
+        if (is_unsigned)
+            return (uint32_t)__Pyx_PyInt_AsUnsignedShort(x);
+        else
+            return (uint32_t)__Pyx_PyInt_AsSignedShort(x);
+    } else if (sizeof(uint32_t) == sizeof(int)) {
+        if (is_unsigned)
+            return (uint32_t)__Pyx_PyInt_AsUnsignedInt(x);
+        else
+            return (uint32_t)__Pyx_PyInt_AsSignedInt(x);
+    } else if (sizeof(uint32_t) == sizeof(long)) {
+        if (is_unsigned)
+            return (uint32_t)__Pyx_PyInt_AsUnsignedLong(x);
+        else
+            return (uint32_t)__Pyx_PyInt_AsSignedLong(x);
+    } else if (sizeof(uint32_t) == sizeof(PY_LONG_LONG)) {
+        if (is_unsigned)
+            return (uint32_t)__Pyx_PyInt_AsUnsignedLongLong(x);
+        else
+            return (uint32_t)__Pyx_PyInt_AsSignedLongLong(x);
+    }  else {
+        #if CYTHON_COMPILING_IN_PYPY && !defined(_PyLong_AsByteArray)
+        PyErr_SetString(PyExc_RuntimeError,
+                        "_PyLong_AsByteArray() not available in PyPy, cannot convert large numbers");
+        #else
+        uint32_t val;
+        PyObject *v = __Pyx_PyNumber_Int(x);
+        #if PY_VERSION_HEX < 0x03000000
+        if (likely(v) && !PyLong_Check(v)) {
+            PyObject *tmp = v;
+            v = PyNumber_Long(tmp);
+            Py_DECREF(tmp);
+        }
+        #endif
+        if (likely(v)) {
+            int one = 1; int is_little = (int)*(unsigned char *)&one;
+            unsigned char *bytes = (unsigned char *)&val;
+            int ret = _PyLong_AsByteArray((PyLongObject *)v,
+                                          bytes, sizeof(val),
+                                          is_little, !is_unsigned);
+            Py_DECREF(v);
+            if (likely(!ret))
+                return val;
+        }
+        #endif
+        return (uint32_t)-1;
+    }
+}
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      return ::std::complex< float >(x, y);
+    }
+  #else
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      return x + y*(__pyx_t_float_complex)_Complex_I;
+    }
+  #endif
+#else
+    static CYTHON_INLINE __pyx_t_float_complex __pyx_t_float_complex_from_parts(float x, float y) {
+      __pyx_t_float_complex z;
+      z.real = x;
+      z.imag = y;
+      return z;
+    }
+#endif
+
+#if CYTHON_CCOMPLEX
+#else
+    static CYTHON_INLINE int __Pyx_c_eqf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+       return (a.real == b.real) && (a.imag == b.imag);
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_sumf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real + b.real;
+        z.imag = a.imag + b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_difff(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real - b.real;
+        z.imag = a.imag - b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_prodf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        z.real = a.real * b.real - a.imag * b.imag;
+        z.imag = a.real * b.imag + a.imag * b.real;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_quotf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+        __pyx_t_float_complex z;
+        float denom = b.real * b.real + b.imag * b.imag;
+        z.real = (a.real * b.real + a.imag * b.imag) / denom;
+        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_negf(__pyx_t_float_complex a) {
+        __pyx_t_float_complex z;
+        z.real = -a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    static CYTHON_INLINE int __Pyx_c_is_zerof(__pyx_t_float_complex a) {
+       return (a.real == 0) && (a.imag == 0);
+    }
+    static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_conjf(__pyx_t_float_complex a) {
+        __pyx_t_float_complex z;
+        z.real =  a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    #if 1
+        static CYTHON_INLINE float __Pyx_c_absf(__pyx_t_float_complex z) {
+          #if !defined(HAVE_HYPOT) || defined(_MSC_VER)
+            return sqrtf(z.real*z.real + z.imag*z.imag);
+          #else
+            return hypotf(z.real, z.imag);
+          #endif
+        }
+        static CYTHON_INLINE __pyx_t_float_complex __Pyx_c_powf(__pyx_t_float_complex a, __pyx_t_float_complex b) {
+            __pyx_t_float_complex z;
+            float r, lnr, theta, z_r, z_theta;
+            if (b.imag == 0 && b.real == (int)b.real) {
+                if (b.real < 0) {
+                    float denom = a.real * a.real + a.imag * a.imag;
+                    a.real = a.real / denom;
+                    a.imag = -a.imag / denom;
+                    b.real = -b.real;
+                }
+                switch ((int)b.real) {
+                    case 0:
+                        z.real = 1;
+                        z.imag = 0;
+                        return z;
+                    case 1:
+                        return a;
+                    case 2:
+                        z = __Pyx_c_prodf(a, a);
+                        return __Pyx_c_prodf(a, a);
+                    case 3:
+                        z = __Pyx_c_prodf(a, a);
+                        return __Pyx_c_prodf(z, a);
+                    case 4:
+                        z = __Pyx_c_prodf(a, a);
+                        return __Pyx_c_prodf(z, z);
+                }
+            }
+            if (a.imag == 0) {
+                if (a.real == 0) {
+                    return a;
+                }
+                r = a.real;
+                theta = 0;
+            } else {
+                r = __Pyx_c_absf(a);
+                theta = atan2f(a.imag, a.real);
+            }
+            lnr = logf(r);
+            z_r = expf(lnr * b.real - theta * b.imag);
+            z_theta = theta * b.real + lnr * b.imag;
+            z.real = z_r * cosf(z_theta);
+            z.imag = z_r * sinf(z_theta);
+            return z;
+        }
+    #endif
+#endif
+
+#if CYTHON_CCOMPLEX
+  #ifdef __cplusplus
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      return ::std::complex< double >(x, y);
+    }
+  #else
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      return x + y*(__pyx_t_double_complex)_Complex_I;
+    }
+  #endif
+#else
+    static CYTHON_INLINE __pyx_t_double_complex __pyx_t_double_complex_from_parts(double x, double y) {
+      __pyx_t_double_complex z;
+      z.real = x;
+      z.imag = y;
+      return z;
+    }
+#endif
+
+#if CYTHON_CCOMPLEX
+#else
+    static CYTHON_INLINE int __Pyx_c_eq(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+       return (a.real == b.real) && (a.imag == b.imag);
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_sum(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real + b.real;
+        z.imag = a.imag + b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_diff(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real - b.real;
+        z.imag = a.imag - b.imag;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_prod(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        z.real = a.real * b.real - a.imag * b.imag;
+        z.imag = a.real * b.imag + a.imag * b.real;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_quot(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+        __pyx_t_double_complex z;
+        double denom = b.real * b.real + b.imag * b.imag;
+        z.real = (a.real * b.real + a.imag * b.imag) / denom;
+        z.imag = (a.imag * b.real - a.real * b.imag) / denom;
+        return z;
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_neg(__pyx_t_double_complex a) {
+        __pyx_t_double_complex z;
+        z.real = -a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    static CYTHON_INLINE int __Pyx_c_is_zero(__pyx_t_double_complex a) {
+       return (a.real == 0) && (a.imag == 0);
+    }
+    static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_conj(__pyx_t_double_complex a) {
+        __pyx_t_double_complex z;
+        z.real =  a.real;
+        z.imag = -a.imag;
+        return z;
+    }
+    #if 1
+        static CYTHON_INLINE double __Pyx_c_abs(__pyx_t_double_complex z) {
+          #if !defined(HAVE_HYPOT) || defined(_MSC_VER)
+            return sqrt(z.real*z.real + z.imag*z.imag);
+          #else
+            return hypot(z.real, z.imag);
+          #endif
+        }
+        static CYTHON_INLINE __pyx_t_double_complex __Pyx_c_pow(__pyx_t_double_complex a, __pyx_t_double_complex b) {
+            __pyx_t_double_complex z;
+            double r, lnr, theta, z_r, z_theta;
+            if (b.imag == 0 && b.real == (int)b.real) {
+                if (b.real < 0) {
+                    double denom = a.real * a.real + a.imag * a.imag;
+                    a.real = a.real / denom;
+                    a.imag = -a.imag / denom;
+                    b.real = -b.real;
+                }
+                switch ((int)b.real) {
+                    case 0:
+                        z.real = 1;
+                        z.imag = 0;
+                        return z;
+                    case 1:
+                        return a;
+                    case 2:
+                        z = __Pyx_c_prod(a, a);
+                        return __Pyx_c_prod(a, a);
+                    case 3:
+                        z = __Pyx_c_prod(a, a);
+                        return __Pyx_c_prod(z, a);
+                    case 4:
+                        z = __Pyx_c_prod(a, a);
+                        return __Pyx_c_prod(z, z);
+                }
+            }
+            if (a.imag == 0) {
+                if (a.real == 0) {
+                    return a;
+                }
+                r = a.real;
+                theta = 0;
+            } else {
+                r = __Pyx_c_abs(a);
+                theta = atan2(a.imag, a.real);
+            }
+            lnr = log(r);
+            z_r = exp(lnr * b.real - theta * b.imag);
+            z_theta = theta * b.real + lnr * b.imag;
+            z.real = z_r * cos(z_theta);
+            z.imag = z_r * sin(z_theta);
+            return z;
+        }
+    #endif
+#endif
+
+static CYTHON_INLINE unsigned char __Pyx_PyInt_AsUnsignedChar(PyObject* x) {
+    const unsigned char neg_one = (unsigned char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned char" :
+                    "value too large to convert to unsigned char");
+            }
+            return (unsigned char)-1;
+        }
+        return (unsigned char)val;
+    }
+    return (unsigned char)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE unsigned short __Pyx_PyInt_AsUnsignedShort(PyObject* x) {
+    const unsigned short neg_one = (unsigned short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned short" :
+                    "value too large to convert to unsigned short");
+            }
+            return (unsigned short)-1;
+        }
+        return (unsigned short)val;
+    }
+    return (unsigned short)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE unsigned int __Pyx_PyInt_AsUnsignedInt(PyObject* x) {
+    const unsigned int neg_one = (unsigned int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(unsigned int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(unsigned int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to unsigned int" :
+                    "value too large to convert to unsigned int");
+            }
+            return (unsigned int)-1;
+        }
+        return (unsigned int)val;
+    }
+    return (unsigned int)__Pyx_PyInt_AsUnsignedLong(x);
+}
+
+static CYTHON_INLINE char __Pyx_PyInt_AsChar(PyObject* x) {
+    const char neg_one = (char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to char" :
+                    "value too large to convert to char");
+            }
+            return (char)-1;
+        }
+        return (char)val;
+    }
+    return (char)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE short __Pyx_PyInt_AsShort(PyObject* x) {
+    const short neg_one = (short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to short" :
+                    "value too large to convert to short");
+            }
+            return (short)-1;
+        }
+        return (short)val;
+    }
+    return (short)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE int __Pyx_PyInt_AsInt(PyObject* x) {
+    const int neg_one = (int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to int" :
+                    "value too large to convert to int");
+            }
+            return (int)-1;
+        }
+        return (int)val;
+    }
+    return (int)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE signed char __Pyx_PyInt_AsSignedChar(PyObject* x) {
+    const signed char neg_one = (signed char)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed char) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed char)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed char" :
+                    "value too large to convert to signed char");
+            }
+            return (signed char)-1;
+        }
+        return (signed char)val;
+    }
+    return (signed char)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE signed short __Pyx_PyInt_AsSignedShort(PyObject* x) {
+    const signed short neg_one = (signed short)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed short) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed short)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed short" :
+                    "value too large to convert to signed short");
+            }
+            return (signed short)-1;
+        }
+        return (signed short)val;
+    }
+    return (signed short)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE signed int __Pyx_PyInt_AsSignedInt(PyObject* x) {
+    const signed int neg_one = (signed int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(signed int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(signed int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to signed int" :
+                    "value too large to convert to signed int");
+            }
+            return (signed int)-1;
+        }
+        return (signed int)val;
+    }
+    return (signed int)__Pyx_PyInt_AsSignedLong(x);
+}
+
+static CYTHON_INLINE int __Pyx_PyInt_AsLongDouble(PyObject* x) {
+    const int neg_one = (int)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+    if (sizeof(int) < sizeof(long)) {
+        long val = __Pyx_PyInt_AsLong(x);
+        if (unlikely(val != (long)(int)val)) {
+            if (!unlikely(val == -1 && PyErr_Occurred())) {
+                PyErr_SetString(PyExc_OverflowError,
+                    (is_unsigned && unlikely(val < 0)) ?
+                    "can't convert negative value to int" :
+                    "value too large to convert to int");
+            }
+            return (int)-1;
+        }
+        return (int)val;
+    }
+    return (int)__Pyx_PyInt_AsLong(x);
+}
+
+static CYTHON_INLINE unsigned long __Pyx_PyInt_AsUnsignedLong(PyObject* x) {
+    const unsigned long neg_one = (unsigned long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to unsigned long");
+            return (unsigned long)-1;
+        }
+        return (unsigned long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to unsigned long");
+                return (unsigned long)-1;
+            }
+            return (unsigned long)PyLong_AsUnsignedLong(x);
+        } else {
+            return (unsigned long)PyLong_AsLong(x);
+        }
+    } else {
+        unsigned long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (unsigned long)-1;
+        val = __Pyx_PyInt_AsUnsignedLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE unsigned PY_LONG_LONG __Pyx_PyInt_AsUnsignedLongLong(PyObject* x) {
+    const unsigned PY_LONG_LONG neg_one = (unsigned PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to unsigned PY_LONG_LONG");
+            return (unsigned PY_LONG_LONG)-1;
+        }
+        return (unsigned PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to unsigned PY_LONG_LONG");
+                return (unsigned PY_LONG_LONG)-1;
+            }
+            return (unsigned PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
+        } else {
+            return (unsigned PY_LONG_LONG)PyLong_AsLongLong(x);
+        }
+    } else {
+        unsigned PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (unsigned PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsUnsignedLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE long __Pyx_PyInt_AsLong(PyObject* x) {
+    const long neg_one = (long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to long");
+            return (long)-1;
+        }
+        return (long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to long");
+                return (long)-1;
+            }
+            return (long)PyLong_AsUnsignedLong(x);
+        } else {
+            return (long)PyLong_AsLong(x);
+        }
+    } else {
+        long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (long)-1;
+        val = __Pyx_PyInt_AsLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE PY_LONG_LONG __Pyx_PyInt_AsLongLong(PyObject* x) {
+    const PY_LONG_LONG neg_one = (PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to PY_LONG_LONG");
+            return (PY_LONG_LONG)-1;
+        }
+        return (PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to PY_LONG_LONG");
+                return (PY_LONG_LONG)-1;
+            }
+            return (PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
+        } else {
+            return (PY_LONG_LONG)PyLong_AsLongLong(x);
+        }
+    } else {
+        PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE signed long __Pyx_PyInt_AsSignedLong(PyObject* x) {
+    const signed long neg_one = (signed long)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to signed long");
+            return (signed long)-1;
+        }
+        return (signed long)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to signed long");
+                return (signed long)-1;
+            }
+            return (signed long)PyLong_AsUnsignedLong(x);
+        } else {
+            return (signed long)PyLong_AsLong(x);
+        }
+    } else {
+        signed long val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (signed long)-1;
+        val = __Pyx_PyInt_AsSignedLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static CYTHON_INLINE signed PY_LONG_LONG __Pyx_PyInt_AsSignedLongLong(PyObject* x) {
+    const signed PY_LONG_LONG neg_one = (signed PY_LONG_LONG)-1, const_zero = 0;
+    const int is_unsigned = neg_one > const_zero;
+#if PY_VERSION_HEX < 0x03000000
+    if (likely(PyInt_Check(x))) {
+        long val = PyInt_AS_LONG(x);
+        if (is_unsigned && unlikely(val < 0)) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "can't convert negative value to signed PY_LONG_LONG");
+            return (signed PY_LONG_LONG)-1;
+        }
+        return (signed PY_LONG_LONG)val;
+    } else
+#endif
+    if (likely(PyLong_Check(x))) {
+        if (is_unsigned) {
+            if (unlikely(Py_SIZE(x) < 0)) {
+                PyErr_SetString(PyExc_OverflowError,
+                                "can't convert negative value to signed PY_LONG_LONG");
+                return (signed PY_LONG_LONG)-1;
+            }
+            return (signed PY_LONG_LONG)PyLong_AsUnsignedLongLong(x);
+        } else {
+            return (signed PY_LONG_LONG)PyLong_AsLongLong(x);
+        }
+    } else {
+        signed PY_LONG_LONG val;
+        PyObject *tmp = __Pyx_PyNumber_Int(x);
+        if (!tmp) return (signed PY_LONG_LONG)-1;
+        val = __Pyx_PyInt_AsSignedLongLong(tmp);
+        Py_DECREF(tmp);
+        return val;
+    }
+}
+
+static int __Pyx_check_binary_version(void) {
+    char ctversion[4], rtversion[4];
+    PyOS_snprintf(ctversion, 4, "%d.%d", PY_MAJOR_VERSION, PY_MINOR_VERSION);
+    PyOS_snprintf(rtversion, 4, "%s", Py_GetVersion());
+    if (ctversion[0] != rtversion[0] || ctversion[2] != rtversion[2]) {
+        char message[200];
+        PyOS_snprintf(message, sizeof(message),
+                      "compiletime version %s of module '%.100s' "
+                      "does not match runtime version %s",
+                      ctversion, __Pyx_MODULE_NAME, rtversion);
+        #if PY_VERSION_HEX < 0x02050000
+        return PyErr_Warn(NULL, message);
+        #else
+        return PyErr_WarnEx(NULL, message, 1);
+        #endif
+    }
+    return 0;
+}
+
+#ifndef __PYX_HAVE_RT_ImportModule
+#define __PYX_HAVE_RT_ImportModule
+static PyObject *__Pyx_ImportModule(const char *name) {
+    PyObject *py_name = 0;
+    PyObject *py_module = 0;
+    py_name = __Pyx_PyIdentifier_FromString(name);
+    if (!py_name)
+        goto bad;
+    py_module = PyImport_Import(py_name);
+    Py_DECREF(py_name);
+    return py_module;
+bad:
+    Py_XDECREF(py_name);
+    return 0;
+}
+#endif
+
+#ifndef __PYX_HAVE_RT_ImportType
+#define __PYX_HAVE_RT_ImportType
+static PyTypeObject *__Pyx_ImportType(const char *module_name, const char *class_name,
+    size_t size, int strict)
+{
+    PyObject *py_module = 0;
+    PyObject *result = 0;
+    PyObject *py_name = 0;
+    char warning[200];
+    Py_ssize_t basicsize;
+#ifdef Py_LIMITED_API
+    PyObject *py_basicsize;
+#endif
+    py_module = __Pyx_ImportModule(module_name);
+    if (!py_module)
+        goto bad;
+    py_name = __Pyx_PyIdentifier_FromString(class_name);
+    if (!py_name)
+        goto bad;
+    result = PyObject_GetAttr(py_module, py_name);
+    Py_DECREF(py_name);
+    py_name = 0;
+    Py_DECREF(py_module);
+    py_module = 0;
+    if (!result)
+        goto bad;
+    if (!PyType_Check(result)) {
+        PyErr_Format(PyExc_TypeError,
+            "%s.%s is not a type object",
+            module_name, class_name);
+        goto bad;
+    }
+#ifndef Py_LIMITED_API
+    basicsize = ((PyTypeObject *)result)->tp_basicsize;
+#else
+    py_basicsize = PyObject_GetAttrString(result, "__basicsize__");
+    if (!py_basicsize)
+        goto bad;
+    basicsize = PyLong_AsSsize_t(py_basicsize);
+    Py_DECREF(py_basicsize);
+    py_basicsize = 0;
+    if (basicsize == (Py_ssize_t)-1 && PyErr_Occurred())
+        goto bad;
+#endif
+    if (!strict && (size_t)basicsize > size) {
+        PyOS_snprintf(warning, sizeof(warning),
+            "%s.%s size changed, may indicate binary incompatibility",
+            module_name, class_name);
+        #if PY_VERSION_HEX < 0x02050000
+        if (PyErr_Warn(NULL, warning) < 0) goto bad;
+        #else
+        if (PyErr_WarnEx(NULL, warning, 0) < 0) goto bad;
+        #endif
+    }
+    else if ((size_t)basicsize != size) {
+        PyErr_Format(PyExc_ValueError,
+            "%s.%s has the wrong size, try recompiling",
+            module_name, class_name);
+        goto bad;
+    }
+    return (PyTypeObject *)result;
+bad:
+    Py_XDECREF(py_module);
+    Py_XDECREF(result);
+    return NULL;
+}
+#endif
+
+static int __pyx_bisect_code_objects(__Pyx_CodeObjectCacheEntry* entries, int count, int code_line) {
+    int start = 0, mid = 0, end = count - 1;
+    if (end >= 0 && code_line > entries[end].code_line) {
+        return count;
+    }
+    while (start < end) {
+        mid = (start + end) / 2;
+        if (code_line < entries[mid].code_line) {
+            end = mid;
+        } else if (code_line > entries[mid].code_line) {
+             start = mid + 1;
+        } else {
+            return mid;
+        }
+    }
+    if (code_line <= entries[mid].code_line) {
+        return mid;
+    } else {
+        return mid + 1;
+    }
+}
+static PyCodeObject *__pyx_find_code_object(int code_line) {
+    PyCodeObject* code_object;
+    int pos;
+    if (unlikely(!code_line) || unlikely(!__pyx_code_cache.entries)) {
+        return NULL;
+    }
+    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
+    if (unlikely(pos >= __pyx_code_cache.count) || unlikely(__pyx_code_cache.entries[pos].code_line != code_line)) {
+        return NULL;
+    }
+    code_object = __pyx_code_cache.entries[pos].code_object;
+    Py_INCREF(code_object);
+    return code_object;
+}
+static void __pyx_insert_code_object(int code_line, PyCodeObject* code_object) {
+    int pos, i;
+    __Pyx_CodeObjectCacheEntry* entries = __pyx_code_cache.entries;
+    if (unlikely(!code_line)) {
+        return;
+    }
+    if (unlikely(!entries)) {
+        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Malloc(64*sizeof(__Pyx_CodeObjectCacheEntry));
+        if (likely(entries)) {
+            __pyx_code_cache.entries = entries;
+            __pyx_code_cache.max_count = 64;
+            __pyx_code_cache.count = 1;
+            entries[0].code_line = code_line;
+            entries[0].code_object = code_object;
+            Py_INCREF(code_object);
+        }
+        return;
+    }
+    pos = __pyx_bisect_code_objects(__pyx_code_cache.entries, __pyx_code_cache.count, code_line);
+    if ((pos < __pyx_code_cache.count) && unlikely(__pyx_code_cache.entries[pos].code_line == code_line)) {
+        PyCodeObject* tmp = entries[pos].code_object;
+        entries[pos].code_object = code_object;
+        Py_DECREF(tmp);
+        return;
+    }
+    if (__pyx_code_cache.count == __pyx_code_cache.max_count) {
+        int new_max = __pyx_code_cache.max_count + 64;
+        entries = (__Pyx_CodeObjectCacheEntry*)PyMem_Realloc(
+            __pyx_code_cache.entries, new_max*sizeof(__Pyx_CodeObjectCacheEntry));
+        if (unlikely(!entries)) {
+            return;
+        }
+        __pyx_code_cache.entries = entries;
+        __pyx_code_cache.max_count = new_max;
+    }
+    for (i=__pyx_code_cache.count; i>pos; i--) {
+        entries[i] = entries[i-1];
+    }
+    entries[pos].code_line = code_line;
+    entries[pos].code_object = code_object;
+    __pyx_code_cache.count++;
+    Py_INCREF(code_object);
+}
+
+#include "compile.h"
+#include "frameobject.h"
+#include "traceback.h"
+static PyCodeObject* __Pyx_CreateCodeObjectForTraceback(
+            const char *funcname, int c_line,
+            int py_line, const char *filename) {
+    PyCodeObject *py_code = 0;
+    PyObject *py_srcfile = 0;
+    PyObject *py_funcname = 0;
+    #if PY_MAJOR_VERSION < 3
+    py_srcfile = PyString_FromString(filename);
+    #else
+    py_srcfile = PyUnicode_FromString(filename);
+    #endif
+    if (!py_srcfile) goto bad;
+    if (c_line) {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, c_line);
+        #else
+        py_funcname = PyUnicode_FromFormat( "%s (%s:%d)", funcname, __pyx_cfilenm, c_line);
+        #endif
+    }
+    else {
+        #if PY_MAJOR_VERSION < 3
+        py_funcname = PyString_FromString(funcname);
+        #else
+        py_funcname = PyUnicode_FromString(funcname);
+        #endif
+    }
+    if (!py_funcname) goto bad;
+    py_code = __Pyx_PyCode_New(
+        0,            /*int argcount,*/
+        0,            /*int kwonlyargcount,*/
+        0,            /*int nlocals,*/
+        0,            /*int stacksize,*/
+        0,            /*int flags,*/
+        __pyx_empty_bytes, /*PyObject *code,*/
+        __pyx_empty_tuple, /*PyObject *consts,*/
+        __pyx_empty_tuple, /*PyObject *names,*/
+        __pyx_empty_tuple, /*PyObject *varnames,*/
+        __pyx_empty_tuple, /*PyObject *freevars,*/
+        __pyx_empty_tuple, /*PyObject *cellvars,*/
+        py_srcfile,   /*PyObject *filename,*/
+        py_funcname,  /*PyObject *name,*/
+        py_line,      /*int firstlineno,*/
+        __pyx_empty_bytes  /*PyObject *lnotab*/
+    );
+    Py_DECREF(py_srcfile);
+    Py_DECREF(py_funcname);
+    return py_code;
+bad:
+    Py_XDECREF(py_srcfile);
+    Py_XDECREF(py_funcname);
+    return NULL;
+}
+static void __Pyx_AddTraceback(const char *funcname, int c_line,
+                               int py_line, const char *filename) {
+    PyCodeObject *py_code = 0;
+    PyObject *py_globals = 0;
+    PyFrameObject *py_frame = 0;
+    py_code = __pyx_find_code_object(c_line ? c_line : py_line);
+    if (!py_code) {
+        py_code = __Pyx_CreateCodeObjectForTraceback(
+            funcname, c_line, py_line, filename);
+        if (!py_code) goto bad;
+        __pyx_insert_code_object(c_line ? c_line : py_line, py_code);
+    }
+    py_globals = PyModule_GetDict(__pyx_m);
+    if (!py_globals) goto bad;
+    py_frame = PyFrame_New(
+        PyThreadState_GET(), /*PyThreadState *tstate,*/
+        py_code,             /*PyCodeObject *code,*/
+        py_globals,          /*PyObject *globals,*/
+        0                    /*PyObject *locals*/
+    );
+    if (!py_frame) goto bad;
+    py_frame->f_lineno = py_line;
+    PyTraceBack_Here(py_frame);
+bad:
+    Py_XDECREF(py_code);
+    Py_XDECREF(py_frame);
+}
+
+static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
+    while (t->p) {
+        #if PY_MAJOR_VERSION < 3
+        if (t->is_unicode) {
+            *t->p = PyUnicode_DecodeUTF8(t->s, t->n - 1, NULL);
+        } else if (t->intern) {
+            *t->p = PyString_InternFromString(t->s);
+        } else {
+            *t->p = PyString_FromStringAndSize(t->s, t->n - 1);
+        }
+        #else  /* Python 3+ has unicode identifiers */
+        if (t->is_unicode | t->is_str) {
+            if (t->intern) {
+                *t->p = PyUnicode_InternFromString(t->s);
+            } else if (t->encoding) {
+                *t->p = PyUnicode_Decode(t->s, t->n - 1, t->encoding, NULL);
+            } else {
+                *t->p = PyUnicode_FromStringAndSize(t->s, t->n - 1);
+            }
+        } else {
+            *t->p = PyBytes_FromStringAndSize(t->s, t->n - 1);
+        }
+        #endif
+        if (!*t->p)
+            return -1;
+        ++t;
+    }
+    return 0;
+}
+
+static CYTHON_INLINE int __Pyx_PyObject_IsTrue(PyObject* x) {
+   int is_true = x == Py_True;
+   if (is_true | (x == Py_False) | (x == Py_None)) return is_true;
+   else return PyObject_IsTrue(x);
+}
+static CYTHON_INLINE PyObject* __Pyx_PyNumber_Int(PyObject* x) {
+  PyNumberMethods *m;
+  const char *name = NULL;
+  PyObject *res = NULL;
+#if PY_VERSION_HEX < 0x03000000
+  if (PyInt_Check(x) || PyLong_Check(x))
+#else
+  if (PyLong_Check(x))
+#endif
+    return Py_INCREF(x), x;
+  m = Py_TYPE(x)->tp_as_number;
+#if PY_VERSION_HEX < 0x03000000
+  if (m && m->nb_int) {
+    name = "int";
+    res = PyNumber_Int(x);
+  }
+  else if (m && m->nb_long) {
+    name = "long";
+    res = PyNumber_Long(x);
+  }
+#else
+  if (m && m->nb_int) {
+    name = "int";
+    res = PyNumber_Long(x);
+  }
+#endif
+  if (res) {
+#if PY_VERSION_HEX < 0x03000000
+    if (!PyInt_Check(res) && !PyLong_Check(res)) {
+#else
+    if (!PyLong_Check(res)) {
+#endif
+      PyErr_Format(PyExc_TypeError,
+                   "__%s__ returned non-%s (type %.200s)",
+                   name, name, Py_TYPE(res)->tp_name);
+      Py_DECREF(res);
+      return NULL;
+    }
+  }
+  else if (!PyErr_Occurred()) {
+    PyErr_SetString(PyExc_TypeError,
+                    "an integer is required");
+  }
+  return res;
+}
+static CYTHON_INLINE Py_ssize_t __Pyx_PyIndex_AsSsize_t(PyObject* b) {
+  Py_ssize_t ival;
+  PyObject* x = PyNumber_Index(b);
+  if (!x) return -1;
+  ival = PyInt_AsSsize_t(x);
+  Py_DECREF(x);
+  return ival;
+}
+static CYTHON_INLINE PyObject * __Pyx_PyInt_FromSize_t(size_t ival) {
+#if PY_VERSION_HEX < 0x02050000
+   if (ival <= LONG_MAX)
+       return PyInt_FromLong((long)ival);
+   else {
+       unsigned char *bytes = (unsigned char *) &ival;
+       int one = 1; int little = (int)*(unsigned char*)&one;
+       return _PyLong_FromByteArray(bytes, sizeof(size_t), little, 0);
+   }
+#else
+   return PyInt_FromSize_t(ival);
+#endif
+}
+static CYTHON_INLINE size_t __Pyx_PyInt_AsSize_t(PyObject* x) {
+   unsigned PY_LONG_LONG val = __Pyx_PyInt_AsUnsignedLongLong(x);
+   if (unlikely(val == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())) {
+       return (size_t)-1;
+   } else if (unlikely(val != (unsigned PY_LONG_LONG)(size_t)val)) {
+       PyErr_SetString(PyExc_OverflowError,
+                       "value too large to convert to size_t");
+       return (size_t)-1;
+   }
+   return (size_t)val;
+}
+
+
+#endif /* Py_PYTHON_H */
diff --git a/pykdtree/test_tree.py b/pykdtree/test_tree.py
new file mode 100644
index 0000000..2c00e5b
--- /dev/null
+++ b/pykdtree/test_tree.py
@@ -0,0 +1,272 @@
+import numpy as np
+
+from pykdtree.kdtree import KDTree
+
+
+data_pts_real = np.array([[  790535.062,  -369324.656,  6310963.5  ],
+       [  790024.312,  -365155.688,  6311270.   ],
+       [  789515.75 ,  -361009.469,  6311572.   ],
+       [  789011.   ,  -356886.562,  6311869.5  ],
+       [  788508.438,  -352785.969,  6312163.   ],
+       [  788007.25 ,  -348707.219,  6312452.   ],
+       [  787509.188,  -344650.875,  6312737.   ],
+       [  787014.438,  -340616.906,  6313018.   ],
+       [  786520.312,  -336604.156,  6313294.5  ],
+       [  786030.312,  -332613.844,  6313567.   ],
+       [  785541.562,  -328644.375,  6313835.5  ],
+       [  785054.75 ,  -324696.031,  6314100.5  ],
+       [  784571.188,  -320769.5  ,  6314361.5  ],
+       [  784089.312,  -316863.562,  6314618.5  ],
+       [  783610.562,  -312978.719,  6314871.5  ],
+       [  783133.   ,  -309114.312,  6315121.   ],
+       [  782658.25 ,  -305270.531,  6315367.   ],
+       [  782184.312,  -301446.719,  6315609.   ],
+       [  781715.062,  -297643.844,  6315847.5  ],
+       [  781246.188,  -293860.281,  6316083.   ],
+       [  780780.125,  -290096.938,  6316314.5  ],
+       [  780316.312,  -286353.469,  6316542.5  ],
+       [  779855.625,  -282629.75 ,  6316767.5  ],
+       [  779394.75 ,  -278924.781,  6316988.5  ],
+       [  778937.312,  -275239.625,  6317206.5  ],
+       [  778489.812,  -271638.094,  6317418.   ],
+       [  778044.688,  -268050.562,  6317626.   ],
+       [  777599.688,  -264476.75 ,  6317831.5  ],
+       [  777157.625,  -260916.859,  6318034.   ],
+       [  776716.688,  -257371.125,  6318233.5  ],
+       [  776276.812,  -253838.891,  6318430.5  ],
+       [  775838.125,  -250320.266,  6318624.5  ],
+       [  775400.75 ,  -246815.516,  6318816.5  ],
+       [  774965.312,  -243324.953,  6319005.   ],
+       [  774532.062,  -239848.25 ,  6319191.   ],
+       [  774100.25 ,  -236385.516,  6319374.5  ],
+       [  773667.875,  -232936.016,  6319555.5  ],
+       [  773238.562,  -229500.812,  6319734.   ],
+       [  772810.938,  -226079.562,  6319909.5  ],
+       [  772385.25 ,  -222672.219,  6320082.5  ],
+       [  771960.   ,  -219278.5  ,  6320253.   ],
+       [  771535.938,  -215898.609,  6320421.   ],
+       [  771114.   ,  -212532.625,  6320587.   ],
+       [  770695.   ,  -209180.859,  6320749.5  ],
+       [  770275.25 ,  -205842.562,  6320910.5  ],
+       [  769857.188,  -202518.125,  6321068.5  ],
+       [  769442.312,  -199207.844,  6321224.5  ],
+       [  769027.812,  -195911.203,  6321378.   ],
+       [  768615.938,  -192628.859,  6321529.   ],
+       [  768204.688,  -189359.969,  6321677.5  ],
+       [  767794.062,  -186104.844,  6321824.   ],
+       [  767386.25 ,  -182864.016,  6321968.5  ],
+       [  766980.062,  -179636.969,  6322110.   ],
+       [  766575.625,  -176423.75 ,  6322249.5  ],
+       [  766170.688,  -173224.172,  6322387.   ],
+       [  765769.812,  -170038.984,  6322522.5  ],
+       [  765369.5  ,  -166867.312,  6322655.   ],
+       [  764970.562,  -163709.594,  6322786.   ],
+       [  764573.   ,  -160565.781,  6322914.5  ],
+       [  764177.75 ,  -157435.938,  6323041.   ],
+       [  763784.188,  -154320.062,  6323165.5  ],
+       [  763392.375,  -151218.047,  6323288.   ],
+       [  763000.938,  -148129.734,  6323408.   ],
+       [  762610.812,  -145055.344,  6323526.5  ],
+       [  762224.188,  -141995.141,  6323642.5  ],
+       [  761847.188,  -139025.734,  6323754.   ],
+       [  761472.375,  -136066.312,  6323863.5  ],
+       [  761098.125,  -133116.859,  6323971.5  ],
+       [  760725.25 ,  -130177.484,  6324077.5  ],
+       [  760354.   ,  -127247.984,  6324181.5  ],
+       [  759982.812,  -124328.336,  6324284.5  ],
+       [  759614.   ,  -121418.844,  6324385.   ],
+       [  759244.688,  -118519.102,  6324484.5  ],
+       [  758877.125,  -115629.305,  6324582.   ],
+       [  758511.562,  -112749.648,  6324677.5  ],
+       [  758145.625,  -109879.82 ,  6324772.5  ],
+       [  757781.688,  -107019.953,  6324865.   ],
+       [  757418.438,  -104170.047,  6324956.   ],
+       [  757056.562,  -101330.125,  6325045.5  ],
+       [  756697.   ,   -98500.266,  6325133.5  ],
+       [  756337.375,   -95680.289,  6325219.5  ],
+       [  755978.062,   -92870.148,  6325304.5  ],
+       [  755621.188,   -90070.109,  6325387.5  ],
+       [  755264.625,   -87280.008,  6325469.   ],
+       [  754909.188,   -84499.828,  6325549.   ],
+       [  754555.062,   -81729.609,  6325628.   ],
+       [  754202.938,   -78969.43 ,  6325705.   ],
+       [  753850.688,   -76219.133,  6325781.   ],
+       [  753499.875,   -73478.836,  6325855.   ],
+       [  753151.375,   -70748.578,  6325927.5  ],
+       [  752802.312,   -68028.188,  6325999.   ],
+       [  752455.75 ,   -65317.871,  6326068.5  ],
+       [  752108.625,   -62617.344,  6326137.5  ],
+       [  751764.125,   -59926.969,  6326204.5  ],
+       [  751420.125,   -57246.434,  6326270.   ],
+       [  751077.438,   -54575.902,  6326334.5  ],
+       [  750735.312,   -51915.363,  6326397.5  ],
+       [  750396.188,   -49264.852,  6326458.5  ],
+       [  750056.375,   -46624.227,  6326519.   ],
+       [  749718.875,   -43993.633,  6326578.   ]])
+       
+def test1d():
+    
+    data_pts = np.arange(1000)
+    kdtree = KDTree(data_pts, leafsize=15)
+    query_pts = np.arange(400, 300, -10)
+    dist, idx = kdtree.query(query_pts)
+    assert idx[0] == 400
+    assert dist[0] == 0
+    assert idx[1] == 390
+    
+def test3d():
+
+    
+    #7, 93, 45    
+    query_pts = np.array([[  787014.438,  -340616.906,  6313018.],
+                          [751763.125, -59925.969, 6326205.5],
+                          [769957.188, -202418.125, 6321069.5]])
+                          
+                          
+    kdtree = KDTree(data_pts_real)
+    dist, idx = kdtree.query(query_pts, sqr_dists=True)
+
+    epsilon = 1e-5
+    assert idx[0] == 7
+    assert idx[1] == 93
+    assert idx[2] == 45
+    assert dist[0] == 0
+    assert abs(dist[1] - 3.) < epsilon * dist[1]
+    assert abs(dist[2] - 20001.) < epsilon * dist[2]
+
+def test3d_float32():
+
+    
+    #7, 93, 45    
+    query_pts = np.array([[  787014.438,  -340616.906,  6313018.],
+                          [751763.125, -59925.969, 6326205.5],
+                          [769957.188, -202418.125, 6321069.5]], dtype=np.float32)
+                          
+                          
+    kdtree = KDTree(data_pts_real.astype(np.float32))
+    dist, idx = kdtree.query(query_pts, sqr_dists=True)
+    epsilon = 1e-5
+    assert idx[0] == 7
+    assert idx[1] == 93
+    assert idx[2] == 45
+    assert dist[0] == 0
+    assert abs(dist[1] - 3.) < epsilon * dist[1]
+    assert abs(dist[2] - 20001.) < epsilon * dist[2]
+    assert kdtree.data_pts.dtype == np.float32
+
+def test3d_float32_mismatch():
+
+    
+    #7, 93, 45    
+    query_pts = np.array([[  787014.438,  -340616.906,  6313018.],
+                          [751763.125, -59925.969, 6326205.5],
+                          [769957.188, -202418.125, 6321069.5]], dtype=np.float32)
+                          
+    kdtree = KDTree(data_pts_real)
+    dist, idx = kdtree.query(query_pts, sqr_dists=True)
+
+def test3d_float32_mismatch2():
+
+    
+    #7, 93, 45    
+    query_pts = np.array([[  787014.438,  -340616.906,  6313018.],
+                          [751763.125, -59925.969, 6326205.5],
+                          [769957.188, -202418.125, 6321069.5]])
+                          
+    kdtree = KDTree(data_pts_real.astype(np.float32))
+    try:
+        dist, idx = kdtree.query(query_pts, sqr_dists=True)
+        assert False
+    except TypeError:
+        assert True 
+ 
+
+def test3d_8n():
+    query_pts = np.array([[  787014.438,  -340616.906,  6313018.],
+                          [751763.125, -59925.969, 6326205.5],
+                          [769957.188, -202418.125, 6321069.5]])
+                          
+    kdtree = KDTree(data_pts_real)
+    dist, idx = kdtree.query(query_pts, k=8)
+    
+    exp_dist = np.array([[  0.00000000e+00,   4.05250235e+03,   4.07389794e+03,   8.08201128e+03,
+                            8.17063009e+03,   1.20904577e+04,   1.22902057e+04,   1.60775136e+04],
+                        [  1.73205081e+00,   2.70216896e+03,   2.71431274e+03,   5.39537066e+03,
+                            5.43793210e+03,   8.07855631e+03,   8.17119970e+03,   1.07513693e+04],
+                        [  1.41424892e+02,   3.25500021e+03,   3.44284958e+03,   6.58019346e+03,
+                            6.81038455e+03,   9.89140135e+03,   1.01918659e+04,   1.31892516e+04]])
+                            
+    exp_idx = np.array([[ 7,  8,  6,  9,  5, 10,  4, 11],
+                        [93, 94, 92, 95, 91, 96, 90, 97],
+                        [45, 46, 44, 47, 43, 48, 42, 49]])
+    
+    assert np.array_equal(idx, exp_idx)
+    assert np.allclose(dist, exp_dist)
+
+def test3d_8n_ub():
+    query_pts = np.array([[  787014.438,  -340616.906,  6313018.],
+                          [751763.125, -59925.969, 6326205.5],
+                          [769957.188, -202418.125, 6321069.5]])
+                          
+    kdtree = KDTree(data_pts_real)
+    dist, idx = kdtree.query(query_pts, k=8, distance_upper_bound=10e3, sqr_dists=False)
+    
+    exp_dist = np.array([[  0.00000000e+00,   4.05250235e+03,   4.07389794e+03,   8.08201128e+03,
+                            8.17063009e+03,   np.Inf,   np.Inf,   np.Inf],
+                        [  1.73205081e+00,   2.70216896e+03,   2.71431274e+03,   5.39537066e+03,
+                            5.43793210e+03,   8.07855631e+03,   8.17119970e+03,   np.Inf],
+                        [  1.41424892e+02,   3.25500021e+03,   3.44284958e+03,   6.58019346e+03,
+                            6.81038455e+03,   9.89140135e+03,   np.Inf,   np.Inf]])
+    n = 100                        
+    exp_idx = np.array([[ 7,  8,  6,  9,  5, n,  n, n],
+                        [93, 94, 92, 95, 91, 96, 90, n],
+                        [45, 46, 44, 47, 43, 48, n, n]])
+   
+    assert np.array_equal(idx, exp_idx)
+    assert np.allclose(dist, exp_dist)
+    
+def test3d_8n_ub_leaf20():
+    query_pts = np.array([[  787014.438,  -340616.906,  6313018.],
+                          [751763.125, -59925.969, 6326205.5],
+                          [769957.188, -202418.125, 6321069.5]])
+                          
+    kdtree = KDTree(data_pts_real, leafsize=20)
+    dist, idx = kdtree.query(query_pts, k=8, distance_upper_bound=10e3, sqr_dists=False)
+    
+    exp_dist = np.array([[  0.00000000e+00,   4.05250235e+03,   4.07389794e+03,   8.08201128e+03,
+                            8.17063009e+03,   np.Inf,   np.Inf,   np.Inf],
+                        [  1.73205081e+00,   2.70216896e+03,   2.71431274e+03,   5.39537066e+03,
+                            5.43793210e+03,   8.07855631e+03,   8.17119970e+03,   np.Inf],
+                        [  1.41424892e+02,   3.25500021e+03,   3.44284958e+03,   6.58019346e+03,
+                            6.81038455e+03,   9.89140135e+03,   np.Inf,   np.Inf]])
+    n = 100                        
+    exp_idx = np.array([[ 7,  8,  6,  9,  5, n,  n, n],
+                        [93, 94, 92, 95, 91, 96, 90, n],
+                        [45, 46, 44, 47, 43, 48, n, n]])
+    
+    assert np.array_equal(idx, exp_idx)
+    assert np.allclose(dist, exp_dist)
+    
+def test3d_8n_ub_eps():
+    query_pts = np.array([[  787014.438,  -340616.906,  6313018.],
+                          [751763.125, -59925.969, 6326205.5],
+                          [769957.188, -202418.125, 6321069.5]])
+                          
+    kdtree = KDTree(data_pts_real)
+    dist, idx = kdtree.query(query_pts, k=8, eps=0.1, distance_upper_bound=10e3, sqr_dists=False)
+    
+    exp_dist = np.array([[  0.00000000e+00,   4.05250235e+03,   4.07389794e+03,   8.08201128e+03,
+                            8.17063009e+03,   np.Inf,   np.Inf,   np.Inf],
+                        [  1.73205081e+00,   2.70216896e+03,   2.71431274e+03,   5.39537066e+03,
+                            5.43793210e+03,   8.07855631e+03,   8.17119970e+03,   np.Inf],
+                        [  1.41424892e+02,   3.25500021e+03,   3.44284958e+03,   6.58019346e+03,
+                            6.81038455e+03,   9.89140135e+03,   np.Inf,   np.Inf]])
+    n = 100                        
+    exp_idx = np.array([[ 7,  8,  6,  9,  5, n,  n, n],
+                        [93, 94, 92, 95, 91, 96, 90, n],
+                        [45, 46, 44, 47, 43, 48, n, n]])
+    
+    assert np.array_equal(idx, exp_idx)
+    assert np.allclose(dist, exp_dist)
+    
+
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000..573837b
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,8 @@
+[nosetests]
+nocapture = 1
+
+[egg_info]
+tag_build = 
+tag_date = 0
+tag_svn_revision = 0
+
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..706bd7d
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,74 @@
+#pykdtree, Fast kd-tree implementation with OpenMP-enabled queries
+# 
+#Copyright (C) 2013  Esben S. Nielsen
+#
+#This program is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+#
+#This program is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+#
+#You should have received a copy of the GNU General Public License
+#along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+from setuptools import setup, Extension
+from setuptools.command.build_ext import build_ext
+import numpy
+
+# Get OpenMP setting from environment  
+try:
+    use_omp = int(os.environ['USE_OMP'])
+except KeyError:
+    use_omp = True
+
+# Custom builder to handler compiler flags. Edit if needed.
+class build_ext_subclass(build_ext):
+    def build_extensions(self):
+        comp = self.compiler.compiler_type 
+        if comp in ('unix', 'cygwin', 'mingw32'):
+            # Check if build is with OpenMP 
+            if use_omp:
+                extra_compile_args = ['-std=c99', '-O3', '-fopenmp']
+                extra_link_args=['-lgomp']
+            else:
+                extra_compile_args = ['-std=c99', '-O3']
+                extra_link_args = []
+        else:
+            # Add support for more compilers here
+            raise ValueError(('Compiler flags undefined for %s.', 
+                             'Please modify setup.py and add compiler flags')
+                             % comp)
+        self.extensions[0].extra_compile_args = extra_compile_args
+        self.extensions[0].extra_link_args = extra_link_args
+        build_ext.build_extensions(self)
+ 
+        
+setup(
+    name='pykdtree',
+    version=0.2,
+    description='Fast kd-tree implementation with OpenMP-enabled queries',
+    author='Esben S. Nielsen',
+    author_email='esn at dmi.dk',
+    packages = ['pykdtree'],
+    install_requires=['numpy'],
+    ext_modules = [Extension('pykdtree.kdtree', 
+                             ['pykdtree/kdtree.c', 'pykdtree/_kdtree_core.c'],
+                             include_dirs=[numpy.get_include()])], 
+    cmdclass = {'build_ext': build_ext_subclass },
+    classifiers=[
+      'Development Status :: 4 - Beta',
+      'License :: OSI Approved :: GNU General Public License v3 (GPLv3)',
+      'Programming Language :: Python',
+      'Operating System :: OS Independent',
+      'Intended Audience :: Science/Research',
+      'Topic :: Scientific/Engineering'
+      ]
+    )
+    
+
+

-- 
Alioth's /usr/local/bin/git-commit-notice on /srv/git.debian.org/git/pkg-grass/pykdtree.git



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