petsc-3.12.5 2020-03-29
MatGetColumnVector
Gets the values from a given column of a matrix.
Synopsis
#include "petscmat.h"
PetscErrorCode MatGetColumnVector(Mat A,Vec yy,PetscInt col)
Not Collective
Input Parameters
| A | - the matrix
|
| yy | - the vector
|
| col | - the column requested (in global numbering)
|
Notes
Each processor for which this is called gets the values for its rows.
Since PETSc matrices are usually stored in compressed row format, this routine
will generally be slow.
The vector must have the same parallel row layout as the matrix.
Contributed by: Denis Vanderstraeten
See Also
MatGetRow(), MatGetDiagonal()
Level
advanced
Location
src/mat/utils/getcolv.c
Implementations
MatGetColumnVector_MPIDense in src/mat/impls/dense/mpi/mpidense.c
MatGetColumnVector_SeqDense in src/mat/impls/dense/seq/dense.c
Index of all Mat routines
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Index of all manual pages