#include "mpi.h" 
#include <stdio.h> 
#define SIZE 4
 int main(argc,argv) 
int argc; char *argv[]; 
{
 int numtasks, rank, sendcount, recvcount, source; 
float sendbuf[SIZE][SIZE] = { 
{1.0, 2.0, 3.0, 4.0}, 
{5.0, 6.0, 7.0, 8.0}, 
{9.0, 10.0, 11.0, 12.0}, 
{13.0, 14.0, 15.0, 16.0} }; 
float recvbuf[SIZE]; 
MPI_Init(&argc,&argv);
 MPI_Comm_rank(MPI_COMM_WORLD, &rank); 
MPI_Comm_size(MPI_COMM_WORLD,&numtasks);
if (numtasks == SIZE) 
{ source = 1; 
sendcount = SIZE; 
recvcount = SIZE;
MPI_Scatter(sendbuf,sendcount,MPI_FLOAT,recvbuf,recvcount, MPI_FLOAT,source,MPI_COMM_WORLD); 
printf("rank= %d Results: %f %f %f %f\n",rank,recvbuf[0], recvbuf[1],recvbuf[2],recvbuf[3]); 
} 
else  printf("Must specify %d processors. Terminating.\n",SIZE); 
MPI_Finalize(); 
}