From help-request at octave dot org Sat Apr 15 20:22:43 2006
Subject: Re: chol?
From: Vic Norton <vic at norton dot name>
To: dastew at sympatico dot ca
cc: Octave Help <help at octave dot org>
Date: Sat, 15 Apr 2006 21:21:28 -0400

Well thanks Doug, Joe, Marius, Jordi, ...

Now I know it's my screwed up system. I love Macintoshes, but I hate
their incompatibilty with the real world.

And now I remember what the Cholesky factor is. You start with an inner
product and an arbitrary basis and construct an orthogonal basis from
that. The first orthogonal vector is a multiple of the first basis
vector. The second orthogonal vector a linear combination of the first
two basis vectors, etc. The Choleksy factor is produced by choosing the
standard delta-ij basis to start with.

Oh well, at least the Octave stuff that is important to me does work on
my system.

Regards,

Vic

On 4/15/06, at 5:35 PM -0400, dastew at sympatico dot ca wrote:
> octave:1> C = [36 24; 24 25];
> octave:2> C
> C =
> 
>   36  24
>   24  25
> 
> octave:3> 
> octave:3> chol(C)
> ans =
> 
>   6  4
>   0  3
> Upper Triangular

On 4/15/06, at 4:16 PM -0400, Vic Norton wrote:
> I start with the matrix
>    octave> C = [36 24; 24 25];
> and do
>    octave> chol(C);
> After waiting for a while I get
>    panic: Bus error -- stopping myself...
>    attempting to save variables to `octave-core'...
>    save to `octave-core' complete
>    Bus error
>    vic$



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