Dear SPMers,
I have a question about .mat files of SPM2.
I can read SPM99 style analyze files with SPM2, and they appear to be
correct. However, when I process them in SPM2, the new files that it
created are flipped. Why would SPM2 read and display the old files
correctly and flip the new files that it created during processing?
Looking into newly created .mat files, I can see matrices M and mat.
Matrix M is identical to that of the original file, but matrix mat has
the first row negated. If I understand it correctly, the files would
not be flipped if matrices M and mat were identical. How and where does
SPM2 calculate this mat matrix? What are the variables that affect it?
(data from .hdr file, default values) Our defaults.analyze.flip is set
to 0.
I would greatly appreciate your advice.
--
Andrew V. Poliakov, Ph.D.
Structural Informatics Group,
Department of Biological Structure,
University of Washington, Box 357420,
Seattle, WA 98195
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