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#
A - the
Matobjectcol - 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#
Matrices, Mat, MATDENSE, MATDENSECUDA, MATDENSEHIP, MatDenseGetColumnVec(), MatDenseGetColumnVecWrite(), MatDenseRestoreColumnVec(), MatDenseRestoreColumnVecRead(), MatDenseRestoreColumnVecWrite()
Level#
intermediate
Location#
Examples#
src/mat/tests/ex237.c
src/mat/tests/ex241.c
src/mat/tests/ex268.c
src/mat/tests/ex318.c
src/mat/tests/ex70.c
src/ksp/ksp/tests/ex90.c
src/ksp/pc/tests/ex16.c
src/snes/tests/ex8.c
Implementations#
MatDenseGetColumnVecRead_MPIDense() in src/mat/impls/dense/mpi/mpidense.c
MatDenseGetColumnVecRead_SeqDense() in src/mat/impls/dense/seq/dense.c
Index of all Mat routines
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