[pymvpa] Zscore creates nan in dataset

Yaroslav Halchenko debian at onerussian.com
Sun Jan 18 17:40:28 UTC 2015

On Sun, 18 Jan 2015, gal star wrote:

>    Hello,
>    Im using zscore, and i receive the following exception:
>    " Some input data for predict is not finite (Nan or Inf)".
>    I've checked my pre-processed nifti files - they don't include Nan values,
>    and yet after using zscore i get that the dataset includes Nan values.
>    How can i fix this situation so i could move forward withA 
>    the processing in my script?
>    I've attached the script i'm using.A 

you must have some invariant (absent variance) features/voxels.  Use 
remove_invariant_features  to strip those away first

Yaroslav O. Halchenko, Ph.D.
http://neuro.debian.net http://www.pymvpa.org http://www.fail2ban.org
Research Scientist,            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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