petsc-3.5.4 2015-05-23
PCMGGetRScale
Gets the pointwise scaling for the restriction operator from level l to l-1.
Synopsis
#include "petscksp.h"
PetscErrorCode PCMGGetRScale(PC pc,PetscInt l,Vec *rscale)
Collective on PC
Input Parameters
| pc | - the multigrid context
|
| rscale | - the scaling
|
| l | - the level (0 is coarsest) to supply [Do not supply 0]
|
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.
Keywords
MG, set, multigrid, restriction, level
See Also
PCMGSetInterpolation(), PCMGGetRestriction()
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