MPI C - Root node receives more than one arrays -

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each slave send array num length len root node. how able store these array in 2d array? 

if (world_rank == root) {     for(i=1; i<world_size;i++) {       // clueless      }     mpi_waitall(world_size-1, &rcv_request[1], &status[1]);   } else {     mpi_isend(num, len, mpi_float, i, 1, mpi_comm_world, &send_request[i]);     mpi_wait(&send_request[1], &status[1]); }


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