MatDenseGetColumnVecWrite — PETSc 3.23.0 documentation

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# MatDenseGetColumnVecWrite

Gives write-only access to a column of a dense matrix, represented as a `Vec`.

## Synopsis

    #include "petscmat.h"
    PetscErrorCode MatDenseGetColumnVecWrite(Mat A, PetscInt col, Vec *v)

Collective

## Input Parameters

- A - the `Mat` object

- col - the column index

## Output Parameter

- v - the vector

## Notes

The vector is owned by PETSc. Users need to call `MatDenseRestoreColumnVecWrite()` when the vector is no longer needed.

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

## See Also

Matrices, `Mat`, `MATDENSE`, `MATDENSECUDA`, `MATDENSEHIP`, `MatDenseGetColumnVec()`, `MatDenseGetColumnVecRead()`, `MatDenseRestoreColumnVec()`, `MatDenseRestoreColumnVecRead()`, `MatDenseRestoreColumnVecWrite()`

## Level

intermediate

## Location

src/mat/impls/dense/seq/dense.c

## Implementations

MatDenseGetColumnVecWrite_MPIDense() in src/mat/impls/dense/mpi/mpidense.c
MatDenseGetColumnVecWrite_SeqDense() in src/mat/impls/dense/seq/dense.c

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