It sounds like there's something wrong with your design matrix. Try loading it into matlab and looking X'*X. If there are significant off-diagonal values, then that means that those components are too correlated to estimate.

doug

Goldman, Aaron (NIH/NIMH) [C] wrote: 
Thanks. I had one more question now that I'm to mri_glmfit. Based on an
error message I'm getting, it seems something about my design matrix
isn't set up right. I'm inputting a text file for x in which each row
looks like:

1	0	0	1	0	42.35

with the first three numbers being my class variable of interest, the
next two gender, and the last age. It tells me the "matrix is
ill-conditioned or badly scaled, condno = 1e+08," and then prints out
the matrix and aborts. Do you know what I need to do differently for
this to work? Thanks,

-Aaron-




-----Original Message-----
From: Doug Greve [mailto:greve@nmr.mgh.harvard.edu] 
Sent: Wednesday, February 14, 2007 11:49 AM
To: Goldman, Aaron (NIH/NIMH) [C]
Cc: freesurfer@nmr.mgh.harvard.edu
Subject: Re: [Freesurfer] smoothing question

something like:

mri_surf2surf --s subject --hemi lh --sval input --tval output --fwhm 5

doug

Goldman, Aaron (NIH/NIMH) [C] wrote:

  
Hi, I'm attempting to do thickness analysis based on the guide at:

http://surfer.nmr.mgh.harvard.edu/docs/ftp/pub/docs/fsgroupana.pdf

For the smoothing part using mri_surf2surf (page 14), I was wondering
what a typical command line should look like.

Thanks,

-Aaron-

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Douglas N. Greve, Ph.D.
MGH-NMR Center
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