[SciPy-User] scipy.sparse.linalg.eigen error code?

Nico Schlömer nico.schloemer@gmail....
Wed Oct 13 08:55:42 CDT 2010


Hi,

I'm using scipy.sparse.linalg.eigen to compute the lowest magnitude
eigenvalue of a matrix, and I noticed that sometimes the code would
return 0+0j where I really didn't expect it. Turns out that tweaking
the number of iterations results in some more meaningful value here,
suggesting that the underlying Arnoldi (ARPACK?) iteration failed with
the maxiter value previously given. As far as I can see, there's no
way to tell that the iteration actually failed.

Is that correct?

Cheers,
Nico


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