Dear list,
as a follow-up to my previous post:
http://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0703&L=spm&O=D&F=&S=&P=14113
I have found out that the problem with loading DCM.mat files can be
solved by putting all the DCM models to be averaged in the same
directory (this is a different behavior than in SPM2, and it also
pertains to the spm_dcm_create function: in SPM5 the VOI files entered
in the specified model must appearently be in the same directory as the
SPM.mat file, otherwise they won't be found/loaded). Has anyone else
seen this?
Still, I am having another problem with spm_dcm_average in SPM5: by
averaging a DCM fitted model over 3 subjects, I encounter the following
error:
>> Warning: Matrix is singular to working precision.
> In spm_dcm_average at 86
In spm_dcm_ui at 882
Warning: Matrix is singular to working precision.
> In spm_dcm_average at 86
In spm_dcm_ui at 882
Warning: Matrix is singular, close to singular or badly scaled.
Results may be inaccurate. RCOND = NaN.
> In spm_dcm_average at 96
In spm_dcm_ui at 882
When I try to review the average model I get:
>> ??? Reference to non-existent field 'M'.
Error in ==> spm_dcm_ui at 339
m = DCM.M.m;
??? Error using ==> spm_dcm_ui
Reference to non-existent field 'M'.
??? Error while evaluating uicontrol Callback
DCM averaging in SPM2 with the same files yields:
>> Warning: Returning NaN for out of range arguments
> In spm_Ncdf at 76
In spm_dcm_average at 93
In spm_dcm_ui at 846
Nevertheless, in SPM2 I can review the estimated DCM_avg model and e.g.
the DCM.A and DCM.B matrices contain real numbers.
Any help would be greatly appreciated!
All the best,
Marco
--
Marco Tettamanti, Ph.D.
San Raffaele Scientific Institute
Facoltà di Psicologia
Via Olgettina 58
I-20132 Milano, Italy
Tel. ++39-02-26434888
Fax ++39-02-26434892
Email: [log in to unmask]
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