# MatDenseGetColumn
gives access to a column of a dense matrix. This is only the local part of the column. You MUST call `MatDenseRestoreColumn()` to avoid memory bleeding. 
## Synopsis
```
#include "petscmat.h" 
PetscErrorCode MatDenseGetColumn(Mat A, PetscInt col, PetscScalar **vals)
```
Not Collective


## Input Parameters

- ***mat -*** a `MATSEQDENSE` or `MATMPIDENSE` matrix
- ***col -*** column index



## Output Parameter

- ***vals -*** pointer to the data





## Note
Use `MatDenseGetColumnVec()` to get access to a column of a `MATDENSE` treated as a `Vec`


## See Also
 `MATDENSE`, `MatDenseRestoreColumn()`, `MatDenseGetColumnVec()`

## Level
intermediate

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

## Examples
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex20opt_ic.c.html">src/ts/tutorials/ex20opt_ic.c.html</A><BR>
<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/ts/tutorials/ex20opt_p.c.html">src/ts/tutorials/ex20opt_p.c.html</A><BR>

## Implementations

<A HREF="PETSC_DOC_OUT_ROOT_PLACEHOLDER/src/mat/impls/dense/mpi/mpidense.c.html#MatDenseGetColumn_MPIDense">MatDenseGetColumn_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#MatDenseGetColumn_SeqDense">MatDenseGetColumn_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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