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# DMDASetRefinementFactor
Set the ratios that the `DMDA` grid is refined 
## Synopsis
```
#include "petscdmda.h"   
PetscErrorCode DMDASetRefinementFactor(DM da, PetscInt refine_x, PetscInt refine_y, PetscInt refine_z)
```
Logically Collective


## Input Parameters

- ***da -*** the `DMDA` object
- ***refine_x -*** ratio of fine grid to coarse in x direction (2 by default)
- ***refine_y -*** ratio of fine grid to coarse in y direction (2 by default)
- ***refine_z -*** ratio of fine grid to coarse in z direction (2 by default)



## Options Database Keys

- ***-da_refine_x refine_x -*** refinement ratio in x direction
- ***-da_refine_y rafine_y -*** refinement ratio in y direction
- ***-da_refine_z refine_z -*** refinement ratio in z direction
- ***-da_refine <n> -*** refine the DMDA object n times when it is created.





## Note
Pass `PETSC_IGNORE` to leave a value unchanged


## See Also
 `DM`, `DMDA`, `DMRefine()`, `DMDAGetRefinementFactor()`

## Level
intermediate

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


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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)