# DMPlexPointLocalRef
return read/write access to a point in local array 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexPointLocalRef(DM dm, PetscInt point, PetscScalar *array, void *ptr)
```
Not Collective


## Input Parameters

- ***dm -*** `DM` defining topological space
- ***point -*** topological point
- ***array -*** array to index into



## Output Parameter

- ***ptr -*** address of reference to point data, type generic so user can place in structure





## Note

## A common usage when data sizes are known statically
```none
  struct { PetscScalar foo,bar,baz; } *ptr;
  DMPlexPointLocalRef(dm,point,array,&ptr);
  ptr->foo = 2; ptr->bar = 3; ptr->baz = 5;
```



## See Also
 [](chapter_unstructured), `DM`, `DMPLEX`, `DMGetLocalSection()`, `PetscSectionGetOffset()`, `PetscSectionGetDof()`, `DMPlexGetPointLocal()`, `DMPlexPointGlobalRef()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/plexpoint.c.html#DMPlexPointLocalRef">src/dm/impls/plex/plexpoint.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/tutorials/ex11.c.html">src/dm/impls/plex/tutorials/ex11.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex17.c.html">src/snes/tutorials/ex17.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex11.c.html">src/ts/tutorials/ex11.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex11_sa.c.html">src/ts/tutorials/ex11_sa.c.html</A><BR>


---
[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/plex/plexpoint.c)


[Index of all DMPlex routines](index.md)  
[Table of Contents for all manual pages](/docs/manualpages/index.md)  
[Index of all manual pages](/docs/manualpages/singleindex.md)  
