[SciPy-Dev] Strange results by eigs

Nils Wagner nwagner@iam.uni-stuttgart...
Fri Oct 21 12:34:02 CDT 2011


On Fri, 21 Oct 2011 10:12:38 -0700
  Jacob VanderPlas <vanderplas@astro.washington.edu> 
wrote:
>>> The docstring of eigs is misleading in that context.
>>>
>>>        M must represent a real symmetric matrix.
>>>
>> Yep, it should say hermitian instead of real sym. here.
> 
> Actually, the piece of the documentation quoted here has 
>to do with the second matrix supplied for the general 
>eigenvalue problem.  This matrix (M) must be real 
>symmetric, as desribed in the ARPACK function 
>documentation
> http://www.caam.rice.edu/software/ARPACK/UG/node137.html
> 
>   Jake
> 

The Hermitian case is here
http://www.caam.rice.edu/software/ARPACK/UG/node138.html

Nils


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