petsc-3.14.5 2021-03-03
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# KSPChebyshevEstEigSetUseNoisy

use a noisy right hand side in order to do the estimate instead of the given right hand side

### Synopsis

    #include "petscksp.h"
    PetscErrorCode KSPChebyshevEstEigSetUseNoisy(KSP ksp,PetscBool use)

Logically Collective

### Input Arguments

| ksp | - linear solver context
| use | - PETSC_TRUE to use noisy

### Options Database

| -ksp_chebyshev_esteig_noisy <true,false>

### Notes

This alledgely works better for multigrid smoothers

### See Also

KSPChebyshevEstEigSet()

### Level

intermediate

### Location

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

### Implementations

KSPChebyshevEstEigSetUseNoisy_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