[SciPy-dev] eigh implementation inconsistency

Nils Wagner nwagner@iam.uni-stuttgart...
Tue Apr 10 06:16:15 CDT 2007

Robert Cimrman wrote:
> I need to solve a symmetric generalized eigenvalue problem, so I have
> looked at the linalg module and found a thing that seems inconsistent to me.
> For general (unsymmetric) problems there is the 'eig' function which
> allows for solving both the regular (via *geev) and generalized (via
> *ggev) eigenvalue problems.
> On the other hand, the function 'eigh' for symmetric (or hermitian)
> problems does not allow the generalized problems, even though there are
> functions in lapack to do it (dsygv, chegv).
> I would modify eigh to accept an optional 'b' argument just like eig
> does. What must be done to have dsygv, chegv wrappers generated? They
> are not generated now, IMHO.
> r.
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Sounds good to me ! It would be a nice improvement.


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