From: unbewusst.sein@... (=?ISO-8859-1?Q?Une_B=E9v?= =?ISO-8859-1?Q?ue?=)
Date: 2007-11-22T22:15:17+09:00
Subject: Re: eigenvector discrepency was (Re: [Matrix] eigenvalues, eigenvectors in Ruby ???)

Axel Etzold <AEtzold@gmx.de> wrote:

> 
> Yes, but that's not what I meant, as you can have different vectors
> mapped to the same vector under a matrix mapping.
> You'd have to check, whether, for a matrix m, the following holds:
> 
> for each v that is an eigenvector to m, and each corresponding eigenvalue
> c (vectors and numbers as delivered by the software),
> 
> m*v=c*v .
> 
> I think one can be pretty sure that this has been thoroughly
> tested for rb-gsl. So, just to gain confidence in extendedmatrix.rb,
> I'd test that.


OK, presently it's what i'm doing.
thanks

> With respect to your Float rounding post, I think '===' is
> a built-in Ruby method of its own, though not necessarily for the
> Float class, and thus this might create problems when
> parsing. So either you introduce additional brackets or you
> rename the method to 'float_round' or something. Just a guess.

no === method (following the pixaxe for Float), ye i'll try another
naming to see...

again, thanks for your reply
-- 
Une B�vue