Re: eignenvalue for nonsymmetric matrix

[Quentin Spencer]

Marino Kekana wrote:

> I have installed gnu octave version 2.1.67 together with octave-
> forge-2004.09.09 on fedora core 3. I want to solve the eigenproblem of
> a non-symmetric full matrix. Octave gives me the following error:
> error: dgeev failed to converge. The sample problem is below.
>
> octave:1> stiff = [1,2,3,4;5,6,7,8;9,10,11,12;13,14,15,16]
> stiff =
>
>   1   2   3   4
>   5   6   7   8
>   9  10  11  12
>  13  14  15  16
>
> octave:2> eig(stiff)
> error: dgeev failed to converge
> octave:2>
>  
This is a problem with the lapack library that comes with Fedora Core 3. 
Download and install the blas and lapack packages at

ftp://coffee.phys.unm.edu/pub/octave/RPMS/i386/

and your problem should go away.

-Quentin



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