#include "petscksp.h" PetscErrorCode PCMGSetRestriction(PC pc,PetscInt l,Mat mat)Logically Collective on PC
|pc||- the multigrid context|
|l||- the level (0 is coarsest) to supply [Do not supply 0]|
|mat||- the restriction matrix|
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.