Re: [Help-gsl] Eigen vector problem

[Patrick Alken]

What you need to check is whether the eigenvector satisfies the 
eigenvalue equation:

A*x = lambda*B*x

If gsl gives you an x which satisfies this equation, then it is an 
eigenvector. It may however differ by a complex scalar from the matlab 
eigenvector, since eigenvectors are unique only up to a scalar factor.

Patrick

On 05/30/2014 04:36 PM, belwafi kais wrote:
> Thank you very much Dr Klaus for your reply.
>
> Attached my c code which i try to calculate the eigenvector of two matrix
> AA and BB. For the eigenvalue it is ok but for the eigenvector it is
> completely different from matlab.
> Thank you for your help.
>
> Best regards
>
>
>
> 2014-05-31 1:26 GMT+03:00 Klaus Huthmacher <address@hidden>:
>
> > Dear Belwafi Kais,
> >
> > maybe you can give us some sourcecode which we can check, e.g. the matrix
> > you are working with?
> >
> > Furthermore, from my humble experience, some eigensolve programs give back
> > normalized eigenvectors some not.
> >
> > Regards,
> > -- Klaus.
>
> --