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

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#

KSP: Linear System Solvers, PCMG, PCMGSetInterpolation()

Level#

advanced

Location#

src/ksp/pc/impls/mg/mgfunc.c

Examples#

src/dm/impls/stag/tutorials/ex4.c


Index of all PC routines
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Index of all manual pages