--- /dev/null
+/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
+/*
+ * (C) 2001 by Argonne National Laboratory.
+ * See COPYRIGHT in top-level directory.
+ */
+#include "mpi.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+/* This example sends a vector and receives individual elements */
+
+int main( int argc, char **argv )
+{
+ MPI_Datatype vec;
+ double *vecin, *vecout, ivalue;
+ int root, i, n, stride, err = 0;
+ int rank, size;
+
+ MPI_Init( &argc, &argv );
+
+ MPI_Comm_size( MPI_COMM_WORLD, &size );
+ MPI_Comm_rank( MPI_COMM_WORLD, &rank );
+
+ n = 12;
+ stride = 10;
+ vecin = (double *)malloc( n * stride * size * sizeof(double) );
+ vecout = (double *)malloc( n * sizeof(double) );
+
+ MPI_Type_vector( n, 1, stride, MPI_DOUBLE, &vec );
+ MPI_Type_commit( &vec );
+
+ for (i=0; i<n*stride*size; i++) vecin[i] = (double)i;
+ for (root=0; root<size; root++) {
+ for (i=0; i<n; i++) vecout[i] = -1.0;
+ MPI_Scatter( vecin, 1, vec, vecout, n, MPI_DOUBLE, root,
+ MPI_COMM_WORLD );
+ ivalue = rank * ((n-1) * stride + 1);
+ for (i=0; i<n; i++) {
+ if (vecout[i] != ivalue) {
+ printf( "Expected %f but found %f\n",
+ ivalue, vecout[i] );
+ err++;
+ }
+ ivalue += stride;
+ }
+ }
+ i = err;
+ MPI_Allreduce( &i, &err, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD );
+ if (rank == 0) {
+ if (err > 0) printf( "Found %d errors!\n", err );
+ else printf( " No Errors\n" );
+ }
+ MPI_Type_free( &vec );
+ MPI_Finalize();
+ return 0;
+
+}
+