[petsc-users] about Singular value

Matthew Knepley knepley at gmail.com
Sun Oct 30 06:17:17 CDT 2011

On Sun, Oct 30, 2011 at 7:49 AM, behzad baghapour <
behzad.baghapour at gmail.com> wrote:

> Dear all,
> What is the procedure or method to calculate Extreme Singular Values when
> calling KSPComputeExtremeSingularValues( )?

Are you asking what is done internally? We call LAPACK SVD on the Hermitian
matrix made by the Krylov method.


> Thanks, B. B.

What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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