petsc-3.7.3 2016-07-24
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# 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

### Examples

src/snes/examples/tutorials/ex12.c.html