petsc-3.11.4 2019-09-28

DMGetAdjacency

Returns the flags for determining variable influence

Synopsis

#include "petscdm.h"          
#include "petscdmlabel.h"     
#include "petscds.h"     
PetscErrorCode DMGetAdjacency(DM dm, PetscInt f, PetscBool *useCone, PetscBool *useClosure)

Not collective

Input Parameters

	dm	- The DM object
	f	- The field number, or PETSC_DEFAULT for the default adjacency

Output Parameter

	useCone	- Flag for variable influence starting with the cone operation
	useClosure	- Flag for variable influence using transitive closure

Notes

    FEM:   Two points p and q are adjacent if q \in closure(star(p)),   useCone = PETSC_FALSE, useClosure = PETSC_TRUE

    FVM:   Two points p and q are adjacent if q \in support(p+cone(p)), useCone = PETSC_TRUE,  useClosure = PETSC_FALSE

    FVM++: Two points p and q are adjacent if q \in star(closure(p)),   useCone = PETSC_TRUE,  useClosure = PETSC_TRUE

Further explanation can be found in the User's Manual Section on the Influence of Variables on One Another.

Level

developer

Location

src/dm/interface/dm.c
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages