Not unlike a well-known US president.
The output for the
multi-dimensional rfftw is a more-conventional array of
fftw_complex
values, but the format here permitted us greater
efficiency in one dimension.
The basic problem is the resolution of the clock: FFTW needs to run for a certain time for the clock to be reliable.
fftwnd
actually may use some temporary
storage (hidden in the plan), but this storage space is only the size of
the largest dimension of the array, rather than being as big as the
entire array. (Unless you use fftwnd
to perform one-dimensional
transforms, in which case the temporary storage required for in-place
transforms is as big as the entire array.)
The etymologically-correct spelling would be
frftw_
, but it is hard to remember.
Each version of cc
seems to have its own magic incantation to get the fastest code most of
the time--you'd think that people would have agreed upon some
convention, e.g. "-Omax
", by now.
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