Then it would be an approximation to the Preconditioned Matrix (JM^(-1) or M^(-1)J) up to the dimension of the Krylov subspace?
On Sun, Oct 30, 2011 at 2:47 PM, Matthew Knepley <knepley at gmail.com> wrote: > 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. > > Matt > > >> 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 > -- ================================== Behzad Baghapour Ph.D. Candidate, Mechecanical Engineering University of Tehran, Tehran, Iran https://sites.google.com/site/behzadbaghapour Fax: 0098-21-88020741 ================================== -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111030/d5728db5/attachment.htm>