petsc-3.14.5 2021-03-03
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# PCMGGetSmootherDown

Gets the KSP context to be used as smoother before coarse grid correction (pre-smoother).

### Synopsis

    #include "petscksp.h"
    PetscErrorCode  PCMGGetSmootherDown(PC pc,PetscInt l,KSP *ksp)

Not Collective, KSP returned is parallel if PC is

### Input Parameters

| pc | - the multigrid context
| l | - the level (0 is coarsest) to supply

### Ouput Parameters

| ksp | - the smoother

### Notes

calling this will result in a different pre and post smoother so you may need to set options on the post smoother also

### See Also

PCMGGetSmootherUp(), PCMGGetSmoother()

### Level

advanced

### Location

src/ksp/pc/impls/mg/mgfunc.c

### Examples

src/snes/tutorials/ex12.c.html
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages