Re: [Help-gsl] Complex eigenvalues

[Hannes Basler]

Hi,
all eigenvalues of a Hermitian Matrix are real, so there is no need  
for complex eigenvalues if you use gsl_eigen_herm(). A symmetric  
matrix is a special case of a hermitian matrix and has also only real  
eigenvalues.
If you have a nonsymmetric real matrix you can use gsl_eigen_nonsymm 
(), this function gives the eigenvalues in a gsl_vector_complex*.
At the moment there is no function to compute the eigenvalues of a  
nonhermitian complex matrix in GSL.

Cheers,
Hannes

On May 10, 2007, at 9:21 AM, Andras Simon wrote:

> Hi there,
>
>
> I have been searching the archives, but could not find the answer  
> to this
> question: how to calculate the complex eigenvalues of a real or  
> complex
> matrix ? I have tried gsl_eigen_herm() and gsl_eigen_symm(), but it  
> appears
> as both functions assume that the eigenvalues are real (the type of
> eigenvalues vector is gsl_vector* type). I could not figure out how  
> to get
> the complex eigenvalues into a gsl_vector_complex*.
> Any ideas ? Comments ?
>
> Any help is appreciated, I'm stuck ;(
>
>
> Thanks,
> Andras Simon
>
> address@hidden
>
>
>
>
>
>
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