On Dec 9, 2015, at 2:22 PM, Douglas N Greve <greve@nmr.mgh.harvard.edu> wrote:

That means that your design matrix is ill-conditioned.

This error means one of two things is wrong with your .par file (located 
in each run of each subject’s bold directory): 1) there are not two or 
more occurrences of one of your conditions; or 2) there is a pattern to 
your conditions (for example condition 3 always follows condition 4). 
You can avoid this error message for the sake of analysis by 1) 
replacing other conditions with occurrences of your missing condition, 
so that each condition is represented at least twice; or 2) by changing 
your conditions so that they break the pattern at least twice. Even 
though the effect of this change is quite small, you should distribute 
the added conditions evenly across the other conditions. Ideally, 
however, you would alter your stimuli so that you do not get this error 
in the first place.


On 12/09/2015 02:19 PM, Christina Pressl wrote:

hi doug,

thank you so much for your quick reply.
yes - I saw this error after I sent you the error log.
I checked the paradigm file, corrected it and rerun everything.

now this error is gone but I still get the following:

   Error using svd
   Input to SVD must not contain NaN or Inf.
   Error in cond (line 36)
    s = svd(A);

   Error in fast_selxavg3 (line254)
    XCond  = cond(XtX);

- - - - - — - - — - - — - — -

   EROOR: fast_selxavg3() failed\n



Your help is much appreciated

On Dec 9, 2015, at 1:57 PM, Douglas N Greve 
<greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu>> wrote:


Did you see the error description:

ERROR:
/space/mdeh5/1/halgdev/projects/christina/FSFAST/Project/NC211_fmri_060515/Sess01/bold/004/oddeven.par
is not correctly formatted. Line 19 only has 0 items

did you check this file?


On 12/09/2015 12:38 PM, Christina Pressl wrote:

Dear Freesurfer Experts,

I am having trouble with selxavg3-sess and was wondering if you could
maybe help me resolving the issue (error log attached)


I ran

#preproc-sess –s Sess01 –surface fsaverage lhrh –mni305 –fwhm 5 –per-run

and the following commands for lh, rh and mni305

#mkanalysis-sess –fsd bold –stc up -surface fsaverage lh -fwhm 5
-event-related  -paradigm oddeven.par -nconditions 3  -spmhrf 0 -TR 2
-refeventdur 10.750 -nskip 4 –mcextreg -polyfit 2  -analysis
oddeven.sm5.lh

#mkcontrast-sess –analysis oddeven.sm5.lh –contrast face-vs-object –a
1 –c 2 –c 3

#mkcontrast-sess –analysis oddeven.sm5.lh –contrast face-vs-fix  –a 
1 –c 0



Thank you very much.

Christina






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MGH-NMR Center
greve@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
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