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Re: Algorithm for conv, filter

From: Stefan van der Walt
Subject: Re: Algorithm for conv, filter
Date: Thu, 8 Dec 2005 17:18:25 +0200
User-agent: Mutt/1.5.9i

Hi Steve

IIRC, conv calculates the convolution per element.  Maybe you are
looking for fftconv.


On Thu, Dec 08, 2005 at 07:01:31AM -0800, Steve C. Thompson wrote:
> Hi,
> I've got $5 on: `conv (a, b)' is implemented as `ifft (af, bf)'
> where AF and BF are the FFTs of A and B (roughly speaking).
> Trying to prove this, I glanced at the octave source code for
> `conv' and I see that it calls `filter'.  (From what I
> understand, `filter' and `conv' are essentially the same but
> `conv' returns a complete convolution while `filter' truncates
> the samples.)  However, I can't figure out what `filter' does
> since I can only find the .oct file on my computer---Linux
> version 2.6.12-9-686 (gcc version 3.4.5 20050809 (prerelease)
> (Ubuntu 3.4.4-6ubuntu8)); GNU Octave, version 2.1.71
> (i486-pc-linux-gnu)---I'm not sure what filter is doing.

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