[pymvpa] Searchlight radius questions

Ping-Hui Chiu chiupinghui at gmail.com
Sun Sep 9 19:24:31 UTC 2012

Dear PyMVPA experts,

r=0, 1, 3 respectively correspond to 1, 9, 123 voxels in the following page:


However, doesn't r=1 encompass 1 center+6 faces=7 voxels?
Also, is there a formula for calculating the number of voxels given a
specific radius?
Finally, suppose a voxel=3*3*3mm, is it correct that r=3 covers up a
neighborhood of (left 3*3mm + center 1*3mm + right 3*3mm)=21mm spherically?

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