[SciPy-user] Why are there two FFTs?

Travis Oliphant oliphant.travis at ieee.org
Fri Jan 6 13:09:53 CST 2006

Gary wrote:

>scipy.fftpack.*   and numpy.dft.*
>are they different under the hood
Yes.  scipy.fftpack can link to fftw and/or djbfft for example which can 
be faster (but also have more install difficulties...).  Also the 
extension module is f2py generated.

numpy.dft always uses an f2c'd version of fftpack and a hand-written 
extension module.


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