petsc-dev 2014-08-19
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KSPChebyshevSetEigenvalues

Sets estimates for the extreme eigenvalues of the preconditioned problem.

Synopsis

#include "petscksp.h" 
PetscErrorCode  KSPChebyshevSetEigenvalues(KSP ksp,PetscReal emax,PetscReal emin)
Logically Collective on KSP

Input Parameters

ksp - the Krylov space context
emax, emin - the eigenvalue estimates

Options Database

-ksp_chebyshev_eigenvalues emin,emax - Note: If you run with the Krylov method of KSPCG with the option -ksp_monitor_singular_value it will for that given matrix and preconditioner an estimate of the extreme eigenvalues.

Keywords

KSP, Chebyshev, set, eigenvalues

Level:intermediate
Location:
src/ksp/ksp/impls/cheby/cheby.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages