DMMGCreate

Creates a DA based multigrid solver object. This allows one to easily implement MG methods on regular grids.

Synopsis

#include "petscda.h"   
#include "petscksp.h"  
#include "petscmg.h"   
#include "petscdmmg.h" 
#include "petscpc.h"   
PetscErrorCode PETSCSNES_DLLEXPORT DMMGCreate(MPI_Comm comm,PetscInt nlevels,void *user,DMMG **dmmg)

Collective on MPI_Comm

Input Parameter

	comm	- the processors that will share the grids and solution process
	nlevels	- number of multigrid levels
	user	- an optional user context

Output Parameters

- the context - Options Database: + -dmmg_nlevels <levels> - number of levels to use

-dmmg_galerkin -use Galerkin approach to compute coarser matrices

-dmmg_mat_type <type> -matrix type that DMMG should create, defaults to MATAIJ

Notes

To provide a different user context for each level call DMMGSetUser() after calling this routine

Examples