petsc-3.13.6 2020-09-29

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)

not collective

Input Parameter

dm -The DM

Output Parameter

	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.

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

Level

advanced

Location