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# DMDAGetCorners
Returns the global (x,y,z) indices of the lower left corner and size of the local region, excluding ghost points. 
## Synopsis
```
#include "petscdmda.h"   
PetscErrorCode DMDAGetCorners(DM da, PetscInt *x, PetscInt *y, PetscInt *z, PetscInt *m, PetscInt *n, PetscInt *p)
```
Not Collective


## Input Parameter

- ***da -*** the distributed array



## Output Parameters

- ***x -*** the corner index for the first dimension
- ***y -*** the corner index for the second dimension (only used in 2D and 3D problems)
- ***z -*** the corner index for the third dimension (only used in 3D problems)
- ***m -*** the width in the first dimension
- ***n -*** the width in the second dimension (only used in 2D and 3D problems)
- ***p -*** the width in the third dimension (only used in 3D problems)





## Note
The corner information is independent of the number of degrees of
freedom per node set with the `DMDACreateXX()` routine. Thus the x, y, z, and
m, n, p can be thought of as coordinates on a logical grid, where each
grid point has (potentially) several degrees of freedom.
Any of y, z, n, and p can be passed in as NULL if not needed.


## See Also
 `DM`, `DMDA`, `DMDAGetGhostCorners()`, `DMDAGetOwnershipRanges()`, `DMStagGetCorners()`

## Level
beginner

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/impls/da/dacorn.c.html#DMDAGetCorners">src/dm/impls/da/dacorn.c</A>

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex10.c.html">src/dm/tutorials/ex10.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex11f90.F90.html">src/dm/tutorials/ex11f90.F90</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex13f90.F90.html">src/dm/tutorials/ex13f90.F90</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex15.c.html">src/dm/tutorials/ex15.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex22.c.html">src/dm/tutorials/ex22.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex3.c.html">src/dm/tutorials/ex3.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex6.c.html">src/dm/tutorials/ex6.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/swarm_ex1.c.html">src/dm/tutorials/swarm_ex1.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/swarm_ex3.c.html">src/dm/tutorials/swarm_ex3.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex14f.F90.html">src/ksp/ksp/tutorials/ex14f.F90</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ksp/ksp/tutorials/ex22f.F90.html">src/ksp/ksp/tutorials/ex22f.F90</A><BR>


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


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