petsc-3.7.5 2017-01-01

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,PetscBool use)

Logically Collective on PC

Input Parameters

	pc	- the multigrid context
	use	- PETSC_TRUE to use the Galerkin process to compute coarse-level operators

Options Database Key

-pc_mg_galerkin <true,false> -

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.

Keywords

MG, set, Galerkin

Examples