Re: FFTW: a problem with in-place 2D r2c transform

Thanks a lot for your kind reply, Steven. I feel very flattered to be
answered by the author himself, and even more confused to continue asking
my dumb questions, but:
1) I read this part of the manual. I didn't realize that allocating more
than is needed was a mistake.
2) I've changed the array sizes to the exact values in your reply. I still
get zero-frequency of 351 for in-place, and 432 for out-of-place.
What am I doing wrong??

Thanks again

The array format for r2c transforms is described in detail at:


http://www.fftw.org/doc/Multi_002dDimensional-DFTs-of-Real-Data.html

In particular, note that

1) the output is n[0] * (n[1]/2 + 1) in size, not n[0]*n[1]

2) the input is n[0] * n[1] in size for out-of-place and n[0] * 2 *
(n[1]/2+1) in size for in-place, where the latter reflects padding to
make room for the complex output.

This is all described in the manual.

Cordially,
Steven G. Johnson




.

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