> Hi the error message is:
>
> Warning: Matrix is singular to working precision
> In c:\windows\desktop\spm99\spm_reslice.m(reslice_adjust)at line 545
> In c:\windows\desktop\spm99\spm_reslice.m at line 126
> In c:\windows\desktop\spm99\spm_realign_ui.m at line 369
>
> I tried ignoring these error messages and let the realigning run its course
> but then when I brought up the supposed realigned images in the display
> function, there were no brain images at all be seen -instead only shaded
> rectangles...
>
> Would you say there's a problem with the data? Have contacted the technical
> support people at mathworks and they said that the pertinent code is over
> 800 lines long, that it would take too long to work through and that I
> should consult the spm mail list , which I have done but it hasn't shed any
> light on the problem. I am a medical student in Dublin trying to get some
> work done on this over the holidays and the hospital physicist is away
> until 2nd Jan. so I can't ask his help until then.....and would really
> appreciate any help anyone might be able to offer.
I see you are using the adjustment option. I would suggest not actually using
adjustment, for reasons that are buried somewhere among the archives of the
spm mailing list:
http://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=ind0102&L=spm&P=R14682
http://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=ind9905&L=spm&P=R3411
http://www.jiscmail.ac.uk/cgi-bin/wa.exe?A2=ind9905&L=spm&P=R2808
The error message you see happens because there are not many images in the time
series, so the adjustment procedure does not have enough degrees of freedom to
work properly.
I hope this helps,
-John
--
Dr John Ashburner.
Functional Imaging Lab., 12 Queen Square, London WC1N 3BG, UK.
tel: +44 (0)20 78337491 or +44 (0)20 78373611 x4381
fax: +44 (0)20 78131420 http://www.fil.ion.ucl.ac.uk/~john
