petsc-3.13.6 2020-09-29
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PCMGSetGalerkin

 Causes the coarser grid matrices to be computed from the finest grid via the Galerkin process: A_i-1 = r_i * A_i * p_i

Synopsis

#include "petscksp.h" 
PetscErrorCode PCMGSetGalerkin(PC pc,PCMGGalerkinType use)
Logically Collective on PC

Input Parameters

pc - the multigrid context
use - one of PC_MG_GALERKIN_BOTH,PC_MG_GALERKIN_PMAT,PC_MG_GALERKIN_MAT, or PC_MG_GALERKIN_NONE

Options Database Key

-pc_mg_galerkin <both,pmat,mat,none> -

Notes

Some codes that use PCMG such as PCGAMG use Galerkin internally while constructing the hierarchy and thus do not use the PCMG construction of the coarser grids.

See Also

PCMGGetGalerkin(), PCMGGalerkinType

Level

intermediate

Location

src/ksp/pc/impls/mg/mg.c

Examples

src/ksp/ksp/tutorials/ex42.c.html
src/ksp/ksp/tutorials/ex70.c.html

Implementations

PCMGSetGalerkin_MG in src/ksp/pc/impls/mg/mg.c

Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages