[Numpy-discussion] fftpack_lite question

Ralf Gommers ralf.gommers@googlemail....
Mon Oct 26 08:33:57 CDT 2009


On Mon, Oct 26, 2009 at 12:04 AM, Ralf Gommers
<ralf.gommers@googlemail.com>wrote:

>
>
> On Sun, Oct 25, 2009 at 11:51 PM, Charles R Harris <
> charlesr.harris@gmail.com> wrote:
>
>>
>>
>> On Sun, Oct 25, 2009 at 4:21 PM, Ralf Gommers <
>> ralf.gommers@googlemail.com> wrote:
>>
>>> Hi all,
>>>
>>> Can anyone tell me if fftpack_lite is an exact C translation of the
>>> fftpack Fortran code? Or at least close enough that the signature, parameter
>>> descriptions and algorithm are the same?
>>>
>>> If so, I can use the fftpack Fortran sources (which have useful comments)
>>> to write docs for fftpack_lite funcs (rfft* and cfft*).
>>>
>>>
>> fft_pack is an interface to a c translation of fftpack. IIRC, it adds some
>> stuff like zerofill and such so it isn't a1-1 matchup. I think it is pretty
>> close, though.
>>
>
> Okay, thanks.  I'll start with the Fortran docs then, and someone familiar
> with the differences could then easily throw in a few notes on that.
>
> There are docs now for all six exposed functions (cfft*, rfft*):
http://docs.scipy.org/numpy/docs/numpy.fft.fftpack_lite/

If anyone with knowledge of the differences between the C and Fortran
versions could add a few notes at the above link, that would be great.

Thanks,
Ralf
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