On Mon, Jun 2, 2014 at 2:26 PM, David Cournapeau
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 :(