petsc-3.7.7 2017-09-25

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KSPChebyshevEstEigSetUseRandom

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

Synopsis

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

Logically Collective

Input Arguments

	ksp	- linear solver context
	use	- PETSC_TRUE to use random

Options Database

Use KSPChebyshevEstEigSetRandom() to provide the random number generator to be used. Otherwise it creates a default

See Also

KSPChebyshevEstEigSet(), PetscRandomCreate(), KSPChebyshevEstEigSetRandom()

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

-ksp_chebyshev_esteig_random <true,false>

- Notes: This alledgely works better for multigrid smoothers