:orphan:
# MatDenseCUDAGetArrayRead
Provides read-only access to the CUDA buffer inside a `MATDENSECUDA` matrix. The array must be restored with `MatDenseCUDARestoreArrayRead()` when no longer needed. 
## Synopsis
```
PetscErrorCode MatDenseCUDAGetArrayRead(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 `MatDenseCUDAGetArrayWrite()`.


## See Also
 `MATDENSECUDA`, `MatDenseCUDAGetArray()`, `MatDenseCUDARestoreArray()`,
`MatDenseCUDARestoreArrayWrite()`, `MatDenseCUDAGetArrayWrite()`,
`MatDenseCUDARestoreArrayRead()`

## Level
developer

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/dense/mpi/cupm/cuda/matmpidensecuda.cu.html#MatDenseCUDAGetArrayRead">src/mat/impls/dense/mpi/cupm/cuda/matmpidensecuda.cu</A>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/impls/dense/mpi/cupm/cuda/matmpidensecuda.cu)


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