[pymvpa] Help with map2nifti()
Yaroslav Halchenko
debian at onerussian.com
Mon Nov 4 16:00:07 UTC 2013
On Mon, 04 Nov 2013, Taku Ito wrote:
> Oh! �I did in fact have one, though it's the Zscore-mapper (I had
> previously thought I checked 'mapper' in res[1].a, but perhaps it came out
> incorrectly). �Though I realize Z-score mapper probably doesn't have a
> reverse mapper, and perhaps that's the issue? �Is there a workaround you
> may be aware of?
hm -- it should not be just a zscore mapper but rather also the ones
which lead to that point. (flattening, feature selection (you had a
mask, right?)). please show print ds.a.mapper and if it is indeed only
zscore -- then a code snippet which lead to that point. Inspect also
either you had a correct mapper right after fmri_dataset
> Thanks!
> On Mon, Nov 4, 2013 at 10:48 AM, Yaroslav Halchenko
> <[1]debian at onerussian.com> wrote:
> On Mon, 04 Nov 2013, Taku Ito wrote:
> > � �Are all datasets supposed to have mappers? �My data set was loaded
> > � �directly from a NIFTI file, using mvpa2.datasets.mri.fmri_dataset,
> and
> > � �when I loaded it there was no mapper attached,
> it should be there under .a.mapper ... see e.g.
> [2]http://www.pymvpa.org/tutorial_datasets.html#loading-fmri-data
> for more information
> > though I attributed it
> > � �target values and chunks. �In other words, my original data set
> also does
> > � �not have any mappers. �Should I be manually attributing mappers to
> my data
> > � �set (e.g., the searchlight call or the z-scoring call) and attach
> all
> > � �those mappers as a Chain?
> let's first figure out if you indeed didn't have any ;-)
--
Yaroslav O. Halchenko, Ph.D.
http://neuro.debian.net http://www.pymvpa.org http://www.fail2ban.org
Senior Research Associate, Psychological and Brain Sciences Dept.
Dartmouth College, 419 Moore Hall, Hinman Box 6207, Hanover, NH 03755
Phone: +1 (603) 646-9834 Fax: +1 (603) 646-1419
WWW: http://www.linkedin.com/in/yarik
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