#include "petscsnes.h" PetscErrorCode SNESFASSetRestriction(SNES snes, PetscInt level, Mat mat)
snes | - the multigrid context | |
mat | - the restriction matrix | |
level | - the level (0 is coarsest) to supply [Do not supply 0] |
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 SNESFASSetInterpolation() is used.