SNESFASSetRestriction#

Sets the matrix 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 SNESFAS nonlinear 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 dimensions which one it is.

If you do not set this, the transpose of the Mat set with SNESFASSetInterpolation() is used.

See Also#

SNES: Nonlinear Solvers, SNES, SNESFAS, SNESFASSetInterpolation(), SNESFASSetInjection()

Level#

advanced

Location#

src/snes/impls/fas/fasfunc.c

Index of all SNESFAS routines
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Index of all manual pages