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# DMDAVecGetArrayRead
Returns a multiple dimension array that shares data with the underlying vector and is indexed using the global dimensions.
## Synopsis
```
#include "petscdmda.h"
PetscErrorCode DMDAVecGetArrayRead(DM da, Vec vec, void *array)
```
Not 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 `DMDAVecRestoreArrayRead()` 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
Use `DMDAVecGetArrayReadF90()` 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.
## See Also
`DM`, `DMDA`, `DMDAVecGetArrayReadF90()`, `DMDAGetGhostCorners()`, `DMDAGetCorners()`, `VecGetArray()`, `VecRestoreArray()`, `DMDAVecRestoreArrayRead()`, `DMDAVecRestoreArrayDOF()`
`DMDAVecGetArrayDOF()`, `DMDAVecGetArray()`, `DMDAVecRestoreArray()`, `DMDAVecGetArrayRead()`, `DMDAVecRestoreArrayRead()`,
`DMStagVecGetArrayRead()`
## Level
intermediate
## Location
src/dm/impls/da/dagetarray.c
## Examples
src/dm/tutorials/ex2.c
src/dm/tutorials/ex3.c
src/ksp/ksp/tutorials/ex43.c
src/snes/tutorials/ex14.c
src/snes/tutorials/ex15.c
src/snes/tutorials/ex19.c
src/snes/tutorials/ex3.c
src/snes/tutorials/ex3k.kokkos.cxx
src/snes/tutorials/ex78.c
src/tao/unconstrained/tutorials/burgers_spectral.c
src/tao/unconstrained/tutorials/spectraladjointassimilation.c
---
[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)