[SciPy-User] Vectorised convolution

Warren Weckesser warren.weckesser@enthought....
Mon Aug 1 21:57:25 CDT 2011


On Mon, Aug 1, 2011 at 9:19 PM, Jason Heeris <jason.heeris@gmail.com> wrote:
> I'm using the scipy.signal.convolve function on an ndarray that represents
> independent sets of data (each set is a row). It seems that with this
> function I need to manually split up the rows to work on them independently,
> otherwise it does a 2D convolution:
>
>     for idx in xrange(0, S):
>         conv[idx] = sp.signal.convolve(inputs[idx], other, mode='full')
> Is there a vectorised version of this function? In other words, if I were
> doing an FFT I'd use np.fft.fft(inputs, axis=1) — is it possible to do a
> single axis convolution on a 2D array?


I show one way to do this in the following SciPy cookbook entry:

    http://www.scipy.org/Cookbook/ApplyFIRFilter

In particular, see the second paragraph.

Warren


> Cheers,
> Jason
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