Dear DCM experts,
I have a question on the matlab code of the routines 'spm_bireduce' and
'spm_bi_reduce'. In the older version of
spm5 'spm_int' worked with 'spm_bi_reduce' in which the second order
partial derivatives in M1 had a factor 1/2. Now
the new version of 'spm_int' works with 'spm_bireduce' (line 82) to
compute M1, and there this factor is missing.
I wonder which is right. Doesn't the 1/2 come from the Taylor-expansion,
where the second order term should have a factor
1/2 ?
Best wishes,
Volker Fischer
University of Regensburg, Germany.
http://www.psychologie.uni-regensburg.de/Greenlee/team/fischer/fischer.html
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