adds a callback to be run when restricting a nonlinear problem to the coarse grid


#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMCoarsenHookAdd(DM fine, PetscErrorCode (*coarsenhook)(DM fine, DM coarse, void *ctx), PetscErrorCode (*restricthook)(DM fine, Mat mrestrict, Vec rscale, Mat inject, DM coarse, void *ctx), void *ctx)

Logically Collective; No Fortran Support

Input Parameters#

  • fine - DM on which to run a hook when restricting to a coarser level

  • coarsenhook - function to run when setting up a coarser level

  • restricthook - function to run to update data on coarser levels (called once per SNESSolve())

  • ctx - [optional] user-defined context for provide data for the hooks (may be NULL)

Calling sequence of coarsenhook#

  • fine - fine level DM

  • coarse - coarse level DM to restrict problem to

  • ctx - optional user-defined function context

Calling sequence of restricthook#

  • fine - fine level DM

  • mrestrict - matrix restricting a fine-level solution to the coarse grid, usually the transpose of the interpolation

  • rscale - scaling vector for restriction

  • inject - matrix restricting by injection

  • coarse - coarse level DM to update

  • ctx - optional user-defined function context


This function is only needed if auxiliary data, attached to the DM with PetscObjectCompose(), needs to be set up or passed from the fine DM to the coarse DM.

If this function is called multiple times, the hooks will be run in the order they are added.

In order to compose with nonlinear preconditioning without duplicating storage, the hook should be implemented to extract the finest level information from its context (instead of from the SNES).

The hooks are automatically called by DMRestrict()

See Also#

DM Basics, DM, DMCoarsenHookRemove(), DMRefineHookAdd(), SNESFASGetInterpolation(), SNESFASGetInjection(), PetscObjectCompose(), PetscContainerCreate()







Index of all DM routines
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Index of all manual pages