Hey Taylor,
Thank you for your answer.
Could you explain more specifically about "powers of 2 combined with powers of 3 and 5 (no more than 3^3 and 5^5, though)"..? Does this mean that 3dDFT adds 8 zero-paddings consisting of 3 and 5? Does zero-padding affect the magnitudes and phases of the DFT?
After performing DFT, I calculated the phases and amplitudes at specific frequencies (e.g. in my experiment, the stimulus has a periodicity at frequency 8). For example, I calculate the phase using the following command.
3dcalc -prefix $output_dir/pb08.${subj}_${hemi}.${hemi}.r{$r}.DFTPHA -cx2r PHASE -a $output_dir/pb07.${subj}_${hemi}.${hemi}.r{$r}.DFT.niml.dset'[8]' -expr "a"
Thanks!
Taek
