petsc-3.11.4 2019-09-28
PCMGSetRScale
Sets the pointwise scaling for the restriction operator from level l to l-1.
Synopsis
#include "petscksp.h"
PetscErrorCode PCMGSetRScale(PC pc,PetscInt l,Vec rscale)
Logically Collective on PC and Vec
Input Parameters
| pc | - the multigrid context
|
| l | - the level (0 is coarsest) to supply [Do not supply 0]
|
rscale -the scaling
Notes
When evaluating a function on a coarse level one does not want to do F(R * x) one does F(rscale * R * x) where rscale is 1 over the row sums of R. It is preferable to use PCMGSetInjection() to control moving primal vectors.
Keywords
MG, set, multigrid, restriction, level
See Also
PCMGSetInterpolation(), PCMGSetRestriction(), PCMGGetRScale(), PCMGSetInjection()
Level
advanced
Location
src/ksp/pc/impls/mg/mgfunc.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages