[SciPy-user] how to build in fftw3 support?

Lin Shao shao@msg.ucsf....
Thu May 22 13:52:51 CDT 2008


One more question. In scipy.fftpack, where isn't there a rfftn()
function (just as numpy.fft.fftpack does)?

Thanks!

On Thu, May 22, 2008 at 11:31 AM, Robert Kern <robert.kern@gmail.com> wrote:
> On Thu, May 22, 2008 at 12:41 PM, Lin Shao <shao@msg.ucsf.edu> wrote:
>> Thanks for the reply. I made sure that scipy/fftpack/_fftpack.so
>> depends on libfftw3. Now if I
>> from scipy import fftpack
>> then I got fftpack (probably using fftw3).
>>
>> Here're some confusions I'd like to get clarified:
>> 1. What's scipy's fft() function in relation to scipy.fftpack package?
>
> It's an alias to numpy.fft(). scipy/__init__.py does
>
>  from numpy import *
>
> in order to expose the numpy functions with a few overrides.
>
>> 2. What're numpy's fft package (from numpy import fft) and fftpack
>> package (from numpy.fft import fftpack)?
>
> They are standard wrappers of the FORTRAN-converted-to-C FFTPACK
> library. They are meant to provide relatively unoptimized FFT
> functionality everywhere without much build hassle.
>
> --
> Robert Kern
>
> "I have come to believe that the whole world is an enigma, a harmless
> enigma that is made terrible by our own mad attempt to interpret it as
> though it had an underlying truth."
>  -- Umberto Eco
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