Sorry, I forgot to mention that I also tried it (2.*X), but it did not work either. Produced the same error.
Actually, after loading all the 948 volumes (.img files) into the matrix, eventually I would like to multiple each voxel's time course with an array (of length 948), voxel-by-voxel, and in the end save the 948 .img volumes with a prefix or as a big 4D nii file. That didn't work and that's why I went back and just tried multiplying images with a scalar like 2 (which didn't work either).
I think I'll need to write a matlab script to accomplish this or do it in afni or fsl but was wondering whether spm/imcalc had an easier way to do this. Do you still think this is possible with spm_imcalc or with any other utility of spm that i am not aware of?
Thanks,
..
Unal
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