```// @HEADER
// ***********************************************************************
//
//                      Didasko Tutorial Package
//                 Copyright (2005) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
//
// Questions about Didasko? Contact Marzio Sala (marzio.sala _AT_ gmail.com)
//
// ***********************************************************************

// Output a vector in MATLAB format

#include "Epetra_ConfigDefs.h"
#ifdef HAVE_MPI
#include "mpi.h"
#include "Epetra_MpiComm.h"
#else
#include "Epetra_SerialComm.h"
#endif
#include "Epetra_Map.h"
#include "Epetra_Vector.h"

/* ======== ============= *
* function Vector2MATLAB *
* ======== ============= *
*
* Print out a Epetra_Vector in a MATLAB format. Each processor prints out
* its part, starting from proc 0 to proc NumProc-1. The first line of
* each processor's output states the number of local rows and of
* local nonzero elements. Output is finished by "End of Vector Output".
*
* Return code:        true if vector has been printed out
* -----------         false otherwise
*
* Parameters:
* ----------
*
* - Epetra_CrsMatrix  reference to vector
* - Epetra_Map        reference to map
*/

bool Vector2MATLAB( const Epetra_Vector & v,
const Epetra_Map & Map)
{

int MyPID = Map.Comm().MyPID();
int NumProc = Map.Comm().NumProc();
int MyLength = v.MyLength();
int GlobalLength = v.GlobalLength();

// print out on cout if no filename is provided

// write on file the dimension of the matrix

if( MyPID == 0 ) cout << "v = zeros(" << GlobalLength << ")\n";

// get update list
int * MyGlobalElements = Map.MyGlobalElements( );

int Row;

for( int Proc=0 ; Proc<NumProc ; ++Proc ) {

if( MyPID == Proc ) {

cout << "% On proc " << Proc << ": ";
cout << MyLength << " rows of ";
cout << GlobalLength << " elements\n";

for( Row=0 ; Row<MyLength ; ++Row ) {
cout << "b(" << MyGlobalElements[Row]
<< ") = " << v[Row] << ";\n";
}

if( MyPID == NumProc-1  ) {
cout << "% End of vector\n";
}

}

Map.Comm().Barrier();
}

return true;

} /* Vector2MATLAB */

// =========== //
// main driver //
// =========== //

int main(int argc, char *argv[])
{

#ifdef HAVE_MPI
MPI_Init(&argc, &argv);
Epetra_MpiComm Comm(MPI_COMM_WORLD);
#else
Epetra_SerialComm Comm;
#endif

// set global dimension to 5, could be any number
int NumGlobalElements = 5;

// create a map
Epetra_Map Map(NumGlobalElements,0,Comm);
Epetra_Vector A(Map);

// fill the vector with random elements
A.Random();

// and output it to stdout
Vector2MATLAB( A, Map );

#ifdef HAVE_MPI
MPI_Finalize();
#endif

return( EXIT_SUCCESS );

} /* main */

#else

#include <stdlib.h>
#include <stdio.h>

int main(int argc, char *argv[])
{