From bug-octave-request at bevo dot che dot wisc dot edu Fri Dec 12 12:52:53 2003
Subject: Re: error in legendre.m for order n=1
From: pkienzle at users dot sourceforge dot net
To: Benjamin Schmidt <benjamin dot schmidt at post dot rwth-aachen dot de>,    bug-octave@bevo.che.wisc.edu
Date: Fri, 12 Dec 2003 13:56:41 -0000

On 1 Oct 2003 at 8:40, Benjamin Schmidt wrote:

> Dear Sirs
> 
> I use Octave Version 2.1.50 for Windows. I encountered an error in the file
> 
> /opt/octave/share/octave/2.1.50/site/m/octave-forge/specfun/legendre.m 
> (Copyright (C) 2000  Kai Habel)
> 
> When calling the function legendre(1,0) the answer is 	0
> 	-0
> 
> but it should be
> 	0
> 	-1
> 
> In his file Kai Habel tried to use the exact expansion of the legendre 
> function for the order n=1 (line 76) but unfortunately made a mistake. The 
> line should look as follows: L=[x; -sqrt(1 - x .^ 2)]; .

Done.  Thanks,

Paul Kienzle
pkienzle at users dot sf dot net



-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
-------------------------------------------------------------