[Numpy-discussion] chirp-z

[Matthieu Brucher]

>
> Umm, no,
>
> There really aren't any transparent fast fft convolutions in SciPy. The
> closest thing is in signaltools, fftconvolve, and if you ask it to convolve,
> say, sequences whose length add up to 7902, then it will do a size 7901
> transform. Because 7901 is prime this takes about 300 times as long as a
> transform of size 8192. That glitch could be fixed, but I think something as
> basic as fftconvolve should reside at a higher level than scipy.signalsanyway, say in
> numpy.fft.
>


Why not scipy.fft then ? It is currently reviewed.


There are other scipy functions that do convolution, but those that use an
> fft are limited. There is a (buggy) version for 2d arrays in stsci, and a
> version with limited (real) functionality in fftpack. I don't see any more.
>


Matthieu
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