petsc-master 2019-09-16
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PCMGSetRestriction

Sets the function to be used to restrict dual vectors from level l to l-1.

Synopsis

#include "petscksp.h" 
PetscErrorCode  PCMGSetRestriction(PC pc,PetscInt l,Mat mat)
Logically Collective on PC

Input Parameters

pc - the multigrid context
l - the level (0 is coarsest) to supply [Do not supply 0]
mat - the restriction matrix

Notes

Usually this is the same matrix used also to set the interpolation for the same level.

One can pass in the interpolation matrix or its transpose; PETSc figures out from the matrix size which one it is.

If you do not set this, the transpose of the Mat set with PCMGSetInterpolation() is used.

See Also

PCMGSetInterpolation(), PCMGetSetInjection()

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