Hi Doug,<br><br>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:<br>
<br><br><div style="margin-left:40px">Saving X matrix to /home/sidkundu/freesurfer/sessions/Heading-TTP/LMV2010_N19_Heading-TTP/bold/TTP-analysis-3/Xtmp.mat<br>Error using svd<br>Input to SVD must not contain NaN or Inf.<br>
<br>Error in cond (line 39)<br>   s = svd(A);<br><br>Error in fast_selxavg3 (line 248)<br>  XCond = cond(XtX);<br> <br>&gt;&gt; ------------------------------------------<br>ERROR: fast_selxavg3() failed\n<br></div><br><br>
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&#39;m wondering what would cause this or why it would only occur for only one subject. <br>
<br clear="all"> _________________________________<br>Sid Kundu<font size="1"><br>Biomedical Engineering<br>Boston University </font><br><br>