Dear FreeSurfers,
On my maiden voyage with selxavg3, I've encoutered an error and could use some help. After processing several subjects successfully, selxavg3 quit unexpectedly. Here is the exact message:
Warning: matrix is singular to working precision
In fast_selxavg3 at 208
ntptot = 666, nX = 31, DOF = 635
??? Error using ==> svd
Input to SVD must not contain NaN or Inf.
Error in ==> cond at 40
s = svd(A);
Error in ==> fast_selxavg3 at 235
XCond = cond(XtX);
Can anyone help me track down the source of this error and/or suggest a fix?
Also, in the course of reviewing the error I saw the following notice:
INFO: Key -timeoffset unrecognized, line 7, skipping
I have the "timeoffset" argument set to half a TR in my mkanalysis step because I included slicetime correction during preprocessing. Does selxavg3 not recognize this option?
Thanks in advance for any help you can provide.
Dan Dillon, Ph.D.
Post-doctoral Fellow
Affective Neuroscience Lab
Dept. of Psychology, Harvard University
Phone: (617) 495-1889
E-mail: dillon@wjh.harvard.edu