It is attached. Finn mentioned it may be due to an event number being missing from the particular subject, which could be possible in the analysis I am doing.
_________________________________
Sid Kundu
Biomedical Engineering
Boston University



On Thu, Mar 1, 2012 at 11:15 AM, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:
It's probably a problem with your design. Can you send me the Xtmp.mat file?
doug


Sid Kundu wrote:
Hi Doug,

I created a new first level analysis along with new contrasts and event numbers for a group of subjects I had previously done analyses on. All but one of the subjects finished selxavg3 without error, but one subject gave the following error:


Saving X matrix to /home/sidkundu/freesurfer/sessions/Heading-TTP/LMV2010_N19_Heading-TTP/bold/TTP-analysis-3/Xtmp.mat
Error using svd
Input to SVD must not contain NaN or Inf.

Error in cond (line 39)
  s = svd(A);

Error in fast_selxavg3 (line 248)
 XCond = cond(XtX);
 >> ------------------------------------------
ERROR: fast_selxavg3() failed\n


I looked at the generated Xtmp.mat file and it shows the design matrix X has all zeros in 2 columns, resulting in NaNs in the same columns for Xn, and corresponding NaNs in XtX. I'm wondering what would cause this or why it would only occur for only one subject.

_________________________________
Sid Kundu
Biomedical Engineering
Boston University


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