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# DMDAGetProcessorSubsets
Returns communicators consisting only of the processors in a `DMDA` adjacent in a particular dimension, corresponding to a logical plane in a 3D grid or a line in a 2D grid.
## Synopsis
```
#include "petscdmda.h"
PetscErrorCode DMDAGetProcessorSubsets(DM da, DMDirection dir, MPI_Comm *subcomm)
```
Collective; No Fortran Support
## Input Parameters
- ***da -*** the distributed array
- ***dir -*** Cartesian direction, either `DM_X`, `DM_Y`, or `DM_Z`
## Output Parameter
- ***subcomm -*** new communicator
## Notes
This routine is useful for distributing one-dimensional data in a tensor product grid.
After use, comm should be freed with `MPI_Comm_free()`
## See Also
`DM`, `DMDA`, `DMDirection`
## Level
advanced
## Location
src/dm/impls/da/dasub.c
## Examples
src/dm/tutorials/ex51.c
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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/dm/impls/da/dasub.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)