On Mon, Jun 2, 2014 at 2:26 PM, David Cournapeau <courn...@gmail.com> wrote:
> FFTW is not used anymore in neither numpy or scipy (has not been for several
> years). If you want to use fftw with numpy, there are 3rd party extensions
> to do it, like pyfftw
>
>

If it was once supported in numpy, does someone remember the reason
why it was removed? Was it the license or a technical reason?

In the long term I would like to add fftw support to numpy, at least
for the source distribution where the licensing is no concern.
Some testing I did a while ago showed fftpack and fftw have different
numerical behaviour and depending on the size fftpack can be faster
due to fftws overheads when not using pregenerated plans, so to avoid
breaking user code the implementation should probably be selectable at
runtime by the user instead of hardwiring the implementation at
compile time.
But I don't know if I'll ever find the time to do so :(
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