petsc-master 2019-07-21
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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.

See Also

DMSetAdjacency(), DMGetField(), DMSetField()

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