n798(2):  
n798(2):   Process        3 is active.
n804(0):  
n804(0):   Process        1 is active.
n804(0):  
n804(0): MATVEC - Master process:
n804(0):   FORTRAN90 version
n804(0):   An MPI example program to compute
n804(0):   a matrix-vector product b = A * x.
n804(0):  
n804(0):   The number of processes is        4
n804(0):  
n804(0):   Process        0 is active.
n804(0):  
n804(0):   The number of rows is         100
n804(0):   The number of columns is       50
n798(2):  
n798(2):   Process        2 is active.
n804(0): 0 - MPI_SEND : Invalid message tag -1
n804(0): [0] [] Aborting Program!
Cleaning up all processes ...done.
Cleaning up all processes ...done.