MatGetGhosts

Get the global indices of all ghost nodes defined by the sparse matrix

Synopsis

#include "petscmat.h" 
PetscErrorCode MatGetGhosts(Mat mat, PetscInt *nghosts, const PetscInt *ghosts[])

Collective

Input Parameter

• mat - the matrix

Output Parameters

• nghosts - number of ghosts (for MATBAIJ and MATSBAIJ matrices there is one ghost for each matrix block)

• ghosts - the global indices of the ghost points

Note

nghosts and ghosts are suitable to pass into VecCreateGhost() or VecCreateGhostBlock()

See Also

Matrices, Mat, VecCreateGhost(), VecCreateGhostBlock()

Level

advanced

Location

src/mat/interface/matrix.c

Implementations

MatGetGhosts_MPIAIJ() in src/mat/impls/aij/mpi/mpiaij.c
MatGetGhosts_MPIBAIJ() in src/mat/impls/baij/mpi/mpibaij.c
MatGetGhosts_MPISELL() in src/mat/impls/sell/mpi/mpisell.c

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