We're running into a problem doing a wrfx group analysis using FreeSurfer 4.5. Looks like the glmfit is having trouble with the weights. We tried running it for different subsets of our subjects, and get the same thing, so it's not one subject contaminating the analysis. Any guess where we should look for tracking this down? Presumably the cesvar files are screwed up somehow, which would imply something went wrong in the individual selxavg3's. But any ideas about what could lead to this? The individual overlays all seem to look ok.
[sidkundu@brodmann all-vs-null]$ mri_glmfit --y tal.ces.nii --osgm --glmdir tal.wrfx.osgm --nii --mask ../tal.mask.nii --wls tal.cesvar.nii
$Id: mri_glmfit.c,v 1.138.2.15 2009/07/27 17:43:10 greve Exp $
cwd /home/sidkundu/freesurfer/sessions/Heading-TTP/1-24-12-TTP/TTP_analysis/all-vs-null
cmdline mri_glmfit --y tal.ces.nii --osgm --glmdir tal.wrfx.osgm --nii --mask ../tal.mask.nii --wls tal.cesvar.nii
sysname Linux
hostname
brodmann.bu.edumachine x86_64
user sidkundu
FixVertexAreaFlag = 1
UseMaskWithSmoothing 1
OneSampleGroupMean 1
y /home/sidkundu/freesurfer/sessions/Heading-TTP/1-24-12-TTP/TTP_analysis/all-vs-null/tal.ces.nii
logyflag 0
usedti 0
mask ../tal.mask.nii
maskinv 0
glmdir tal.wrfx.osgm
IllCondOK 0
DoFFx 0
wFile tal.cesvar.nii
weightinv 1
weightsqrt 1
Creating output directory tal.wrfx.osgm
Loading y from /home/sidkundu/freesurfer/sessions/Heading-TTP/1-24-12-TTP/TTP_analysis/all-vs-null/tal.ces.nii
Saving design matrix to tal.wrfx.osgm/Xg.dat
Matrix condition is 1
Pruning voxels by thr: 0.000000
Found 260736 voxels in mask
Saving mask to tal.wrfx.osgm/mask.nii
search space = 2.08589e+06
ERROR: MRInormWeights: value less than or eq to 0.
c=34, r=2, s=33, v=0