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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.
StÃ©fan
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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