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 - DMobject
- f - The field number, or - PETSC_DEFAULTfor the default adjacency
Output Parameters#
- 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.
See Also#
DM Basics, DM, DMSetAdjacency(), DMGetField(), DMSetField()
Level#
developer
Location#
Index of all DM routines
Table of Contents for all manual pages
Index of all manual pages