DMCreateMassMatrix#

Gets the mass matrix between two DM objects, M_ij = \int \phi_i \psi_j where the \phi are Galerkin basis functions for a a Galerkin finite element model on the DM

Synopsis#

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

Collective

Input Parameters#

  • dmc - the target DM object

  • dmf - the source DM object

Output Parameter#

  • mat - the mass matrix

Notes#

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

if dmc is dmf then x^t M x is an approximation to the L2 norm of the vector x which is obtained by DMCreateGlobalVector()

See Also#

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

Level#

developer

Location#

src/dm/interface/dm.c

Examples#

src/dm/impls/swarm/tutorials/ex1.c
src/dm/impls/swarm/tutorials/ex1f90.F90
src/snes/tutorials/ex36.c

Implementations#

DMCreateMassMatrix_Plex in src/dm/impls/plex/plex.c
DMCreateMassMatrix_Swarm in src/dm/impls/swarm/swarm.c

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