petsc-3.7.7 2017-09-25
   
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.
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