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# DMDAVecGetArrayWrite
Returns a multiple dimension array that shares data with the underlying vector and is indexed using the global dimensions. 
## Synopsis
```
#include "petscdmda.h"   
PetscErrorCode DMDAVecGetArrayWrite(DM da, Vec vec, void *array)
```
Logically Collective


## Input Parameters

- ***da -*** the distributed array
- ***vec -*** a vector the same size as one obtained with `DMCreateGlobalVector()` or `DMCreateLocalVector()`



## Output Parameter

- ***array -*** the array





## Notes
Call `DMDAVecRestoreArray()` once you have finished accessing the vector entries.

In C, the indexing is "backwards" from what expects: array[k][j][i] NOT array[i][j][k]!

if `vec` is a local vector (obtained with `DMCreateLocalVector()` etc) then the ghost point locations are accessible. If it is
a global vector then the ghost points are not accessible. Of course with the local vector you will have had to do the
appropriate `DMGlobalToLocalBegin()` and `DMGlobalToLocalEnd()` to have correct values in the ghost locations.

The accessible indices are `array[zs:zs+zm-1][ys:ys+ym-1][xs:xs+xm-1]` where the values are obtained from
`DMDAGetCorners()` for a global vector or `DMDAGetGhostCorners()` for a local vector.


## Fortran Notes
From Fortran use `DMDAVecGetArrayWriteF90()` and pass for the array type PetscScalar,pointer :: array(:,...,:) of the appropriate
dimension. For a `DMDA` created with a dof of 1 use the dimension of the `DMDA`, for a `DMDA` created with a dof greater than 1 use one more than the
dimension of the `DMDA`.

The order of the indices is `array(xs:xs+xm-1,ys:ys+ym-1,zs:zs+zm-1)` (when dof is 1) otherwise
`array(0:dof-1,xs:xs+xm-1,ys:ys+ym-1,zs:zs+zm-1)` where the values are obtained from
`DMDAGetCorners()` for a global vector or `DMDAGetGhostCorners()` for a local vector.


## Developer Note
This has code duplication with `DMDAVecGetArray()` and `DMDAVecGetArrayRead()`


## See Also
 `DM`, `DMDA`, `DMDAGetGhostCorners()`, `DMDAGetCorners()`, `VecGetArray()`, `VecRestoreArray()`, `DMDAVecRestoreArrayWrite()`, `DMDAVecRestoreArrayDOF()`
`DMDAVecGetArrayDOF()`, `DMDAVecGetArray()`, `DMDAVecRestoreArray()`, `DMDAVecGetArrayRead()`, `DMDAVecRestoreArrayRead()`

## Level
intermediate

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/dm/tutorials/ex2.c.html">src/dm/tutorials/ex2.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/snes/tutorials/ex19.c.html">src/snes/tutorials/ex19.c</A><BR>


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