Dear Xin Di,
This looks like the problem I had a few weeks ago, see
http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0506&L=SPM&P=R16596&I=-3
and Darren's response for an explanation and suggestions to fix the problem.
Cheers,
Jan
> Dear SPM users,
>
> I got some problems when I try to run a PPI analysis. After creating a
> PPI_*.mat by using the PPIs button, I find a warning message in the
MATLAB>
> command window:
>
> Warning: Matrix is singular to working precision.
> (Type "warning off MATLAB:singularMatrix" to suppress this warning.)
> > In d:\hehe\spm analysis\spm2\spm_peb_ppi.m at line 204
>
> And I find the elements in vector PPI.Y are all NaNs.
>
> What does the warning message mean? And is there anything wrong? How can
I>
> solve this problem? I beg your help. Many thanks!
>
> Best,
>
> Xin Di
>
--
Jan Gläscher NeuroImage Nord
+49-40-42803-7890 (office) Dept. of Systems Neuroscience, Bldg S10
+49-40-42803-9955 (fax) University Medical Center Hamburg-Eppendorf
[log in to unmask] Martinistr. 52
20246 Hamburg
Germany
http://www.uke.uni-hamburg.de/kliniken/neurologie/index_16969.php
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