PETSc version 3.16.5
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# DMCreateNeumannOverlap

Generates an IS, an unassembled (Neumann) Mat, a setup function, and the corresponding context to be used by PCHPDDM.

### Synopsis

    #include "petscdmplex.h"
    PetscErrorCode DMCreateNeumannOverlap_Plex(DM dm, IS *ovl, Mat *J, PetscErrorCode (**setup)(Mat, PetscReal, Vec, Vec, PetscReal, IS, void*), void **setup_ctx)

### Input Parameter

| dm | - preconditioner context

### Output Parameters

| ovl | - index set of overlapping subdomains
| J | - unassembled (Neumann) local matrix
| setup | - function for generating the matrix
| setup_ctx | - context for setup

### Options Database Keys

| -dm_plex_view_neumann_original | - view the DM without overlap
| -dm_plex_view_neumann_overlap | - view the DM with overlap as needed by PCHPDDM

### See Also

DMCreate(), DM, MATIS, PCHPDDM, PCHPDDMSetAuxiliaryMat()

### Level

advanced

### Location

src/dm/impls/plex/plexhpddm.c

### Implementations

DMCreateNeumannOverlap_pforest(DM dm, IS* ovl, Mat *J, PetscErrorCode (**setup) in src/dm/impls/forest/p4est/pforest.c
DMCreateNeumannOverlap_Plex(DM dm, IS *ovl, Mat *J, PetscErrorCode (**setup) in src/dm/impls/plex/plexhpddm.c
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