DMGetDefaultConstraints#

Get the PetscSection and Mat that specify the local constraint interpolation. See DMSetDefaultConstraints() for a description of the purpose of constraint interpolation.

Synopsis#

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMGetDefaultConstraints(DM dm, PetscSection *section, Mat *mat, Vec *bias)

not Collective

Input Parameter#

  • dm - The DM

Output Parameters#

  • section - The PetscSection describing the range of the constraint matrix: relates rows of the constraint matrix to dofs of the default section. Returns NULL if there are no local constraints.

  • mat - The Mat that interpolates local constraints: its width should be the layout size of the default section. Returns NULL if there are no local constraints.

  • bias - Vector containing bias to be added to constrained dofs

Note#

This gets borrowed references, so the user should not destroy the PetscSection, Mat, or Vec.

See Also#

DM Basics, DM, DMSetDefaultConstraints()

Level#

advanced

Location#

src/dm/interface/dm.c

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