:orphan:
# MatDenseGetColumnVecRead
Gives read-only access to a column of a dense matrix, represented as a Vec. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatDenseGetColumnVecRead(Mat A, PetscInt col, Vec *v)
```
Collective


## Input Parameters

- ***mat -*** the `Mat` object
- ***col -*** the column index



## Output Parameter

- ***v -*** the vector





## Notes
The vector is owned by PETSc and users cannot modify it.

Users need to call `MatDenseRestoreColumnVecRead()` when the vector is no longer needed.

Use `MatDenseGetColumnVec()` to obtain read-write access or `MatDenseGetColumnVecWrite()` for write-only access.


## See Also
 [](ch_matrices), `Mat`, `MATDENSE`, `MATDENSECUDA`, `MATDENSEHIP`, `MatDenseGetColumnVec()`, `MatDenseGetColumnVecWrite()`, `MatDenseRestoreColumnVec()`, `MatDenseRestoreColumnVecRead()`, `MatDenseRestoreColumnVecWrite()`

## Level
intermediate

## Location
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/dense/seq/dense.c.html#MatDenseGetColumnVecRead">src/mat/impls/dense/seq/dense.c</A>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/dense/mpi/mpidense.c.html#MatDenseGetColumnVecRead_MPIDense">MatDenseGetColumnVecRead_MPIDense in src/mat/impls/dense/mpi/mpidense.c</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/dense/seq/dense.c.html#MatDenseGetColumnVecRead_SeqDense">MatDenseGetColumnVecRead_SeqDense in src/mat/impls/dense/seq/dense.c</A><BR>


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[Edit on GitLab](https://gitlab.com/petsc/petsc/-/edit/release/src/mat/impls/dense/seq/dense.c)


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