From help-request at octave dot org Mon Jan 17 13:09:08 2005
Subject: Re: Very slow filter.cc
From: akira at rsch dot tuis dot ac dot jp
To: David dot Bateman at motorola dot com
Cc: help at octave dot org
Date: Tue, 18 Jan 2005 04:09:49 +0900 (JST)

Thanks for your comment, David,

From: David Bateman <David dot Bateman at motorola dot com>
>What was going to be my first step was to compile three different 
>versions of octave.
>These being 2.1.50, 2.1.57 and 2.1.64, which correspond to the last 
>three testing releases. The first before NDArray's were integrated, the 
>second when NDArray's were integrated, but the filter function wasn't 
>changed to use them and the last with the filter function converted to 
>NDArray's. Getting the times of the test case you propose for these 
>three build, would really confirm your problem.

I tried octave-2.1.50 and octave-2.1.57. It took the same time as
octave-2.1.64. It means NDarray support in both filter.cc and octave
is not the slowing factor, is it right?

Also, I carefully compared filter.cc of octave-2.1.50 and
octave-2.0.17. It seems there is no difference in filtering algorithm
itself. I realized that the slow filter.cc comes from more essential
part of octave-2.1.x.

_/_/_/  _/  _/            _/            _/_/        Akira NISHIMURA
 _/    _/  _/            _/             | Dept. of Media and Cultural Studies
_/okyo _/_/niversity of _/nformation _/_/ciences akira at rsch dot tuis dot ac dot jp
                   http://www.rsch.tuis.ac.jp/~akira



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