petsc-3.7.3 2016-07-24
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# MatGetGhosts

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

### Synopsis

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

Collective on Mat

### Input Parameter

mat -the matrix

### Output Parameters

| nghosts | - number of ghosts (note for BAIJ matrices there is one ghost for each block)
| ghosts | - the global indices of the ghost points

Notes: the nghosts and ghosts are suitable to pass into VecCreateGhost()

Level:advanced
Location: src/mat/interface/matrix.c
Index of all Mat routines
Table of Contents for all manual pages
Index of all manual pages