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# DMPlexPointLocalRead
return read access to a point in local array 
## Synopsis
```
#include "petscdmplex.h"   
PetscErrorCode DMPlexPointLocalRead(DM dm, PetscInt point, const 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 read reference to point data, type generic so user can place in structure





## Note

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



## See Also
 [](ch_unstructured), `DM`, `DMPLEX`, `DMGetLocalSection()`, `PetscSectionGetOffset()`, `PetscSectionGetDof()`, `DMPlexGetPointLocal()`, `DMPlexPointGlobalRead()`

## Level
intermediate

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/plex/tutorials/ex6.c.html">src/dm/impls/plex/tutorials/ex6.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex11.c.html">src/ts/tutorials/ex11.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex11_sa.c.html">src/ts/tutorials/ex11_sa.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex18.c.html">src/ts/tutorials/ex18.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex52.c.html">src/ts/tutorials/ex52.c</A><BR>


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[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](/manualpages/index.md)  
[Index of all manual pages](/manualpages/singleindex.md)