DMCreateGradientMatrix

Gets the gradient matrix between two DM objects, M_(ic)j = \int \partial_c \phi_i \psi_j where the \phi are Galerkin basis functions for a Galerkin finite element model on the DM

Synopsis

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMCreateGradientMatrix(DM dmc, DM dmf, Mat *mat)

Collective

Input Parameters

• dmc - the target DM object

• dmf - the source DM object, can be NULL

Output Parameter

• mat - the gradient matrix

Notes

For DMPLEX the finite element model for the DM must have been already provided.

See Also

DM Basics, DM, DMCreateMassMatrix(), DMCreateMassMatrixLumped(), DMCreateMatrix(), DMRefine(), DMCoarsen(), DMCreateRestriction(), DMCreateInterpolation(), DMCreateInjection()

Level

developer

Location

src/dm/interface/dm.c

Implementations

DMCreateGradientMatrix_Plex() in src/dm/impls/plex/plex.c
DMCreateGradientMatrix_Swarm() in src/dm/impls/swarm/swarm.c

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