PPT Slide
/* This example handles a 12 x 12 mesh, on 4 processors only. */
int rank, value, size, errcnt, toterr, i, j, itcnt;
double diffnorm, gdiffnorm;
double xlocal[(12/4)+2][12];
double xnew[(12/3)+2][12];
MPI_Init( &argc, &argv );
MPI_Comm_rank( MPI_COMM_WORLD, &rank );