# MPI_Recv

Recv data from a node

## Calling Sequence

    value = MPI_Recv(rank,tag)

## Arguments

rank

  The rank. TODO

tag

  The tag. TODO

res

  The value received from MPI_Send.

## Description

Receive a variable from a specified node. The value is usually sent by the function MPI_Send.

## Technical implementation

For more information on the implementation of Scilab/MPI, please see Technical details about the implementation

## Examples

                MPI_Init();
                rnk =    MPI_Comm_rank();
                sizeNodes =    MPI_Comm_size();

                SLV = rnk;                // handy shortcuts, master is rank 0
                Master = ~ SLV;            // slaves are all other
                tag=0;
                if Master
                // The master node
                for slaveId = 1:sizeNodes-1
                // Send data to the slaves
                value = rand(100,100) + rand(100,100) * %i;
                MPI_Send(value, slaveId);
                end

                for slaveId = 1:sizeNodes-1
                valueBack=MPI_Recv(slaveId, tag);
                // Check that the slaves gaves us what we expected
                assert_checkequal(valueBack,value + 1);
                end
                else
                // The slaves
                rankSource=0;
                // Receive the information from the master
                value=MPI_Recv(rankSource);
                // Increment all the values by one
                value=value+1;
                // Send back to the master
                MPI_Send(value,0);

                end

                MPI_Finalize();

## See Also

- MPI_Send