petsc-3.7.1 2016-05-15
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 Many br
Input Parameters
| pc | - the multigrid context Many br |
| l | - the level (0 is coarsest) to supply [Do not supply 0] Many br |
rscale -the scaling Many br
Many br
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. Many br
Keywords
MG, set, multigrid, restriction, level
See Also
PCMGSetInterpolation(), PCMGSetRestriction(), PCMGGetRScale()
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