Hi, I'm attempting an inaugural run through the FS pipeline on some event-related data collected over 6 runs. I'm not sure if this makes any difference, but the experiment is self-paced, and the events are of varying duration (it's a lexical decision task, and participants can take up to 4 seconds to respond but typically respond between 600 - 800ms, with an exponentially-decreasing jittered ITI between trials).
When I run selxavg3-sess on this single participant, the following error is generated:
/********************************** Saving X matrix to /home/kali/fMRI/LDT/1001_001/bold/LDT.sm6.lh/Xtmp.mat Error using svd Input to SVD must not contain NaN or Inf.
Error in cond (line 35) s = svd(A);
Error in fast_selxavg3 (line 279) XCond = cond(XtX);
ERROR: fast_selxavg3() failed\n *******************************************/
If I open up the generated .mat file, I see the several rows/columns of the XtX matrix are indeed populated with NaN. We tried running the mkanalysis-sess a couple different ways, getting the same error, though our different parameter selections for mkanalysis-sess lead to different XtX matrices, so I suspect that this might be the source of the problem. Unfortunately, I have no insight into what the root of the problem might be. The .par files used have the event durations set to the reaction times for each trial, and the -refeventdur value is set to the mean reaction time
Thanks for any help anyone might be able to give me
Can you send me the Xtmp.mat file?
On 2/2/16 6:40 PM, Mcnorgan, Christopher wrote:
Hi, I'm attempting an inaugural run through the FS pipeline on some event-related data collected over 6 runs. I'm not sure if this makes any difference, but the experiment is self-paced, and the events are of varying duration (it's a lexical decision task, and participants can take up to 4 seconds to respond but typically respond between 600 - 800ms, with an exponentially-decreasing jittered ITI between trials).
When I run selxavg3-sess on this single participant, the following error is generated:
/********************************** Saving X matrix to /home/kali/fMRI/LDT/1001_001/bold/LDT.sm6.lh/Xtmp.mat Error using svd Input to SVD must not contain NaN or Inf.
Error in cond (line 35) s = svd(A);
Error in fast_selxavg3 (line 279) XCond = cond(XtX);
ERROR: fast_selxavg3() failed\n *******************************************/
If I open up the generated .mat file, I see the several rows/columns of the XtX matrix are indeed populated with NaN. We tried running the mkanalysis-sess a couple different ways, getting the same error, though our different parameter selections for mkanalysis-sess lead to different XtX matrices, so I suspect that this might be the source of the problem. Unfortunately, I have no insight into what the root of the problem might be. The .par files used have the event durations set to the reaction times for each trial, and the -refeventdur value is set to the mean reaction time
Thanks for any help anyone might be able to give me _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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Mcnorgan, Christopher