Sets the function to be used to restrict the defect from level l to l-1.
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]
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 SNESFASSetInterpolation()
FAS, MG, set, multigrid, restriction, level
Index of all SNESFAS routines
Table of Contents for all manual pages
Index of all manual pages