[SciPy-user] most negative eigenvalue

[Alan G Isaac]

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