PETSc version 3.17.4
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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> | - set the matrices to form via the Galerkin process

### 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
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