We have a need to do larger 2D FFT's frequently. In those cases, I
process the FFT's a series of 1D FFT's, transpose the data (using
mtrans), do a series of 1D FFT's again and then transpose the data
back.The 1D FFT (zrop) has a range of 3 to 20.
I wrote a tutorial on MacResearch.org for doing this for 3D FFT's
(that is 2D FFT, transpose, 1D FFT, transpose). Note that my use of
log2 to get the base 2 exponent is incorrect in the tutorial (at least
will not work correctly on Intel based machines). You should
substitute the log2 calls, with an integer log2. But otherwise, the
general scheme works.
If I read the vDSP manual correctly, the vDSP_fft2d_zrop function can
only operate on matrices up to 1024 by 1024 in size because
log2nInCol nad log2nInRow must be between 3 and 10 and 2^10 is 1024.
Is my interpretation of the manual correct? Is anyone doing ffts on
larger arrays? If so, what are you using?
Thanks,
Jeff
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David W. Gohara, Ph.D.
Center for Computational Biology
Washington University School of Medicine
http://www.sbgrid.orghttp://www.macresearch.org
314-362-1583 (phone) <=== NEW New Number
617-216-8616 (cell)
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