petsc-3.9.4 2018-09-11
PCMGSetRestriction
Sets the function to be used to restrict dual vectors from level l to l-1.
Synopsis
#include "petscksp.h"
PetscErrorCode PCMGSetRestriction(PC pc,PetscInt l,Mat mat)
Logically Collective on PC and Mat
Input Parameters
| pc | - the multigrid context
|
| l | - the level (0 is coarsest) to supply [Do not supply 0]
|
| mat | - the restriction matrix
|
Notes
Usually this is the same matrix used also to set the interpolation
for the same level.
One can pass in the interpolation matrix or its transpose; PETSc figures
out from the matrix size which one it is.
If you do not set this, the transpose of the Mat set with PCMGSetInterpolation()
is used.
Keywords
MG, set, multigrid, restriction, level
See Also
PCMGSetInterpolation(), PCMGetSetInjection()
Level
advanced
Location
src/ksp/pc/impls/mg/mgfunc.c
Index of all PCMG routines
Table of Contents for all manual pages
Index of all manual pages