[SciPy-user] most negative eigenvalue

[lorenzo bolla]

you might be interested in ARPACK, too. it can find the first n eigvals with
minimum/maximum real/imag/abs value. it can handle also symmetric matrices.
its python interface is in scipy.sandbox.arpack.
hth,
lorenzo.


On 8/28/07, Alan G Isaac <aisaac at american.edu> wrote:
>
> On Tue, 28 Aug 2007, dmitrey apparently wrote:
>
> > hi all,
> > what's the best way to solve the problem:
>
> > A - symmetric real matrix.
> > I need to find is A positive-definite, and if not, I need to know what's
> > the most negative eigenvalue does it has?
>
> I know you mean, what is the best SciPy way,
> but you may be interested in the PETSc routines.
> There is some minimum eigenvalue stuff in there.
> (Some of these may also be useful to openopt;
> note that the license is NOT GPL:
> http://www-unix.mcs.anl.gov/petsc/petsc-as/documentation/copyright.html)
>
> Cheers,
> Alan Isaac
>
>
>
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