petsc-3.7.3 2016-07-24
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# DMPlexGetAdjacency

Return all points adjacent to the given point

### Synopsis

    #include "petscdmplex.h"
    #include "petscdmlabel.h"
    PetscErrorCode DMPlexGetAdjacency(DM dm, PetscInt p, PetscInt *adjSize, PetscInt *adj[])

### Input Parameters

| dm | - The DM object
| p | - The point
| adjSize | - The maximum size of adj if it is non-NULL, or PETSC_DETERMINE
| adj | - Either NULL so that the array is allocated, or an existing array with size adjSize

### Output Parameters

| adjSize | - The number of adjacent points
| adj | - The adjacent points

Notes: The user must PetscFree the adj array if it was not passed in.

### See Also

DMPlexSetAdjacencyUseCone(), DMPlexSetAdjacencyUseClosure(), DMPlexDistribute(), DMCreateMatrix(), DMPlexPreallocateOperator()

Level:advanced
Location: src/dm/impls/plex/plexdistribute.c
Index of all DM routines
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