DMMGSetUseGalerkinCoarse

 Courses the DMMG to use R*A_f*R^T to form the coarser matrices from finest

Synopsis

#include "petscda.h"   
#include "petscksp.h"  
#include "petscmg.h"   
#include "petscdmmg.h" 
#include "petscpc.h"   
PetscErrorCode PETSCSNES_DLLEXPORT DMMGSetUseGalerkinCoarse(DMMG* dmmg)
Collective on DMMG

Input Parameter

dmmg -the context

Options Database Keys

-dmmg_galerkin -

Notes: After you have called this you can manually set dmmg[0]->galerkin = PETSC_FALSE to have the coarsest grid not compute via Galerkin but still have the intermediate grids computed via Galerkin.

The default behavior of this should be idential to using -pc_mg_galerkin; this offers more potential flexibility since you can select exactly which levels are done via Galerkin and which are done via user provided function.

See Also

DMMGCreate(), PCMGSetUseGalerkin(), DMMGSetMatType(), DMMGSetNullSpace()

Level:advanced
Location:src/snes/utils/damg.c
Index of all DA routines
Table of Contents for all manual pages
Index of all manual pages