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Re: Problem With Solving Matrix Equations
From: |
Robert A. Macy |
Subject: |
Re: Problem With Solving Matrix Equations |
Date: |
Wed, 10 May 2006 13:28:11 -0700 |
Using binary Windows octave2.1.50ainst.exe on a Win98
get exactly the right answers.
- Robert -
On Wed, 10 May 2006 11:23:29 -0700 (PDT)
MoneyHaus <address@hidden> wrote:
>
> The problem I am having with Octave seems rather
> elementary, but I can't seem
> to get my head around it. Solving linear equations using
> the "\" operator,
> such as x=A\B, just won't ever work for me.
>
> For example, the following should solve easily, yet my
> Octave installation
> (latest) won't:
>
> octave:17> A=[0,2,0,1;2,2,3,2;4,-3,0,1.;6,1,-6,-5];
> octave:18> B=[0;-2;-7;6];
> octave:19> inv(A)*B
> ans =
>
> -0.50000
> 1.00000
> 0.33333
> -2.00000
>
> octave:20> A\B
> warning: matrix singular to machine precision, rcond =
> nan
> warning: attempting to find minimum norm solution
>
> And there it stops... it'll just sit there and never
> solve before. I'm
> pretty sure I shouldn't be getting those warning messages
> to being with.
>
> Any help would be greatly appreciated!
>