Gets an array containing the MPI rank of all the current processes neighbors.
PetscErrorCode DMDAGetNeighbors(DM da,const PetscMPIInt *ranks)
da -the DMDA object
ranks -the neighbors ranks, stored with the x index increasing most rapidly.
this process itself is in the list
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.
In fortran you must pass in an array of the appropriate length.
Index of all DMDA routines
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