c++ - MPI send recv input arguments -

i have problems part of code (i semplified more clear).

//p number of processor (we suppose 2) //vett vector contains elements send //disp vector elements index of first element send //elem vector elements number of elements send //local_v destination vector (of dimension elem[rank]) //local_n number of elements have arrive (=elem[rank]) 

in case cycle executed 1 time

for(unsigned int = 1; < p; i++){     if(rank==0){         mpi_send(&vett[disp[i]], elem[i], mpi_int, i, 0, mpi_comm_world);     }else{         mpi_recv(&local_v, local_n, mpi_int, 0, 0, mpi_comm_world, mpi_status_ignore);     } } 

processor1 sends other(in case processor2). not sure if use correctly mpi_send, in particular i'm not sure first input argument correct...

in mpi_recv missing [0] after receive buffer, entire line:

mpi_recv(&local_v[0], local_n, mpi_int, 0, 0, mpi_comm_world, mpi_status_ignore);