PETSc version 3.17.0
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# DMPlexSetAdjacencyUser

Define adjacency in the mesh using a user-provided callback

### Synopsis

    #include "petscdmplex.h"
    #include "petscdmlabel.h"
    PetscErrorCode DMPlexSetAdjacencyUser(DM dm,PetscErrorCode (*user)(DM,PetscInt,PetscInt*,PetscInt[],void*),void *ctx)

### Input Parameters

| dm | - The DM object
| user | - The user callback, may be NULL (to clear the callback)
| ctx | - context for callback evaluation, may be NULL

### Notes

The caller of DMPlexGetAdjacency may need to arrange that a large enough array is available for the adjacency.

Any setting here overrides other configuration of DMPlex adjacency determination.

### See Also

DMSetAdjacency(), DMPlexDistribute(), DMPlexPreallocateOperator(), DMPlexGetAdjacency(), DMPlexGetAdjacencyUser()

### Level

advanced

### Location

src/dm/impls/plex/plexdistribute.c
Index of all DMPLEX routines
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