petsc-3.3-p7 2013-05-11

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