PETSc version 3.16.5
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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

### Input/Output Parameters

| adjSize | - The maximum size of adj if it is non-NULL, or PETSC_DETERMINE; on output the number of adjacent points
| adj | - Either NULL so that the array is allocated, or an existing array with size adjSize; on output contains the adjacent points

### Notes

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

### See Also

DMSetAdjacency(), DMPlexDistribute(), DMCreateMatrix(), DMPlexPreallocateOperator()

### Level

advanced

### Location

src/dm/impls/plex/plexdistribute.c

### Implementations

DMPlexGetAdjacency_Internal in src/dm/impls/plex/plexdistribute.c
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