MatDenseGetColumn — PETSc 3.23.0 documentation

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# 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

- A - 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

Matrices, `Mat`, `MATDENSE`, `MatDenseRestoreColumn()`, `MatDenseGetColumnVec()`

## Level

intermediate

## Location

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

## Examples

src/ts/tutorials/ex20opt_p.c
src/ts/tutorials/ex20opt_ic.c

## Implementations

MatDenseGetColumn_MPIDense() in src/mat/impls/dense/mpi/mpidense.c
MatDenseGetColumn_SeqDense() in src/mat/impls/dense/seq/dense.c

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Index of all manual pages