petsc-3.14.5 2021-03-03
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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: Call KSPChebyshevEstEigSet() or use the option -ksp_chebyshev_esteig a,b,c,d to have the KSP estimate the eigenvalues and use these estimated values automatically

### Level

intermediate

### Location

src/ksp/ksp/impls/cheby/cheby.c

### Implementations

KSPChebyshevSetEigenvalues_Chebyshev in src/ksp/ksp/impls/cheby/cheby.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages