On Wed, Jun 22, 2011 at 10:37 AM, John Mousel <john.mousel at gmail.com> wrote:
> I'm using ML as a preconditioner, and I want to get an estimate of the > spectral radius of my preconditioned matrix. I see a flag > -pc_ml_SpectralNormScheme_Anorm. Does this need to be set in conjunction > with another flag like -ksp_compute_eigenvalues or something cool I don't > know about? I do not see a way to pull out the estimate from ML. However, you can easily replicate their estimate using -ksp_monitor_singular_values and run GMRES with -pc_type none. If you run with ML, it will estimate the extreme values for the preconditioned operators. Matt > > John > -- 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110622/5165c8f2/attachment.htm>
