petsc-master 2020-09-19
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MatDenseGetSubMatrix

Gives access to a block of columns of a dense matrix, represented as a Mat.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatDenseGetSubMatrix(Mat A,PetscInt cbegin,PetscInt cend,Mat *v)
Collective

Input Parameters

mat - the Mat object
cbegin - the first index in the block
cend - the last index in the block

Output Parameter

v - the matrix

Notes

The matrix is owned by PETSc. Users need to call MatDenseRestoreSubMatrix() when the matrix is no longer needed.

See Also

MATDENSE, MATDENSECUDA, MatDenseGetColumnVec(), MatDenseRestoreColumnVec(), MatDenseRestoreSubMatrix()

Level

intermediate

Location

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

Implementations

MatDenseGetSubMatrix_MPIDense in src/mat/impls/dense/mpi/mpidense.c
MatDenseGetSubMatrix_SeqDenseCUDA in src/mat/impls/dense/seq/cuda/densecuda.cu
MatDenseGetSubMatrix_SeqDense in src/mat/impls/dense/seq/dense.c

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