petsc-3.8.4 2018-03-24

DMDAGetNeighbors

Gets an array containing the MPI rank of all the current processes neighbors.

#include "petscdmda.h"   
PetscErrorCode  DMDAGetNeighbors(DM da,const PetscMPIInt *ranks[])

Not Collective

da - the DMDA object

ranks - the neighbors ranks, stored with the x index increasing most rapidly. this process itself is in the list

Notes: In 2d the array is of length 9, in 3d of length 27 Not supported in 1d Do not free the array, it is freed when the DMDA is destroyed.

Fortran Notes: In fortran you must pass in an array of the appropriate length.