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# MatDenseHIPGetArrayRead
Provides read-only access to the HIP buffer inside a `MATDENSEHIP` matrix. The array must be restored with `MatDenseHIPRestoreArrayRead()` when no longer needed. 
## Synopsis
```
PetscErrorCode MatDenseHIPGetArrayRead(Mat A, const PetscScalar **a)
```
Not Collective


## Input Parameter

- ***A -*** the matrix



## Output Parameter

- ***a -*** the GPU array in column major order





## Note
Data may be copied to the GPU due to operations done on the CPU. If you need write only
access, use `MatDenseHIPGetArrayWrite()`.


## See Also
 `MATDENSEHIP`, `MatDenseHIPGetArray()`, `MatDenseHIPRestoreArray()`,
`MatDenseHIPRestoreArrayWrite()`, `MatDenseHIPGetArrayWrite()`,
`MatDenseHIPRestoreArrayRead()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/dense/mpi/cupm/hip/matmpidensehip.hip.cpp#MatDenseHIPGetArrayRead">src/mat/impls/dense/mpi/cupm/hip/matmpidensehip.hip.cpp</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/impls/dense/mpi/cupm/hip/matmpidensehip.hip.cpp)


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