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# DMDASetSizes
Sets the number of grid points in the three dimensional directions
## Synopsis
```
#include "petscdmda.h"
PetscErrorCode DMDASetSizes(DM da, PetscInt M, PetscInt N, PetscInt P)
```
Logically Collective
## Input Parameters
- ***da -*** the `DMDA`
- ***M -*** the global X size
- ***N -*** the global Y size
- ***P -*** the global Z size
## Developer Note
Since the dimension may not yet have been set the code cannot error check for non-positive Y and Z number of grid points
## See Also
`DM`, `DMDA`, `PetscSplitOwnership()`
## Level
intermediate
## Location
src/dm/impls/da/da.c
## Examples
src/dm/tutorials/ex19.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/da/da.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)