I am trying to run a retinotopy analysis in fsfast, using only polar angle. However, when I try to run it, I am getting the error "Input to SVD must not contain NaN or Inf." I have traced this error and it looks like the design matrix X has 12 regressors (the first 12) that consist solely of zeros. I am using the following commands:
mkanalysis-sess -analysis retinotopy -fsd bold -runlistfile runlist.txt
-native -funcstem fmc -nuisreg mcextreg 3
-retinotopy 36.4 -per-session -paradigm retino.par -inorm
-spmhrf 0 -TR .650 -polyfit 2 -nskip 19
selxavg3-sess -analysis retinotopy -sf sublist.txt -df sessdir
Any idea what the first 12 regressors in the design matrix might correspond to in retinotopy analyses and why they'd be empty? I have looked at the documentation and there doesn't seem to be a clear labeling of the retinotopy design matrix anywhere, although perhaps I'm missing something.