Good Evening All,
 
I'm very new to using MPI; I seem to be struggling to get a basic understanding of the MPI::Comm_World.Scatter Operation, It seem's as though a may be misunderstanding how the scatter operation works. Suppose i have an Array of x amount of doubles, let's say 3 doubles that i want to spread across three processes.
 
I have -
 
#include <iostream>
#include <mpi.h>
int main(int argc, char* argv[])
{
    MPI_Init(&argc, &argv);
    int rank, procs;
    MPI_Comm_size(MPI_COMM_WORLD, &procs);
    MPI_Comm_rank(MPI_COMM_WORLD, &rank);

    double stat[3] ;
    stat[0] = 1.2;
    stat[1] = 65.3;
    stat[2] = 45.3;

    double test3[3];
   
    if (rank==0) {
    MPI::COMM_WORLD.Scatter(
        stat,
        1,
        MPI::DOUBLE,
        &test3,
        1,
        MPI::DOUBLE,
        0);
    }
   std::cout << rank <<" rec'd " << test3[0] << std::endl;
   MPI_Finalize();
}
 
Unfortunately, this doesn't output what i'd like. I'd like: Process 0 to output 1.2, process 1 to output 65.3 and process 2 to output 45.3 etc etc. I apologise if this question is very trivial.
 
Regards,
 
 


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