petsc-3.5.1 2014-08-06
Report Typos and Errors

SNESFASSetRestriction

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

Synopsis

#include "petscsnes.h"  
PetscErrorCode SNESFASSetRestriction(SNES snes, PetscInt level, Mat mat)

Input Parameters

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

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 SNESFASSetInterpolation() is used.

Keywords

FAS, MG, set, multigrid, restriction, level

See Also

SNESFASSetInterpolation(), SNESFASSetInjection()

Level:advanced
Location:
src/snes/impls/fas/fasfunc.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages