/usr/include/trilinos/Galeri_Random.h is in libtrilinos-dev 10.4.0.dfsg-1ubuntu2.
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// ************************************************************************
//
// Galeri: Finite Element and Matrix Generation Package
// Copyright (2006) ETHZ/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 Galeri? Contact Marzio Sala (marzio.sala _AT_ gmail.com)
//
// ************************************************************************
// @HEADER
#ifndef GALERI_RANDOM_H
#define GALERI_RANDOM_H
#include "Galeri_Exception.h"
#include "Galeri_Utils.h"
#include "Epetra_Comm.h"
#include "Epetra_Map.h"
#include "Epetra_Util.h"
namespace Galeri {
namespace Maps {
inline
Epetra_Map*
Random(const Epetra_Comm& Comm, const int n)
{
if (n <= 0)
throw(Exception(__FILE__, __LINE__,
"Incorrect input parameter to Maps::Random()",
"n = " + toString(n)));
// This is the idea: I create the map on proc 0, then I broadcast
// it to all procs. This is not very efficient, but saves some MPI calls.
vector<int> part(n);
if (Comm.MyPID() == 0)
{
Epetra_Util Util;
for (int i = 0 ; i < n ; ++i)
{
unsigned int r = Util.RandomInt();
part[i] = r%(Comm.NumProc());
}
}
Comm.Broadcast(&part[0], n, 0);
// count the elements assigned to this proc
int NumMyElements = 0;
for (int i = 0 ; i < n; ++i)
if (part[i] == Comm.MyPID()) NumMyElements++;
// get the loc2global list
vector<int> MyGlobalElements(NumMyElements);
int count = 0;
for (int i = 0 ; i < n ; ++i)
if (part[i] == Comm.MyPID())
MyGlobalElements[count++] = i;
return(new Epetra_Map(n, NumMyElements, &MyGlobalElements[0], 0, Comm));
} // Random()
} // namespace BlockMaps
} // namespace Galeri
#endif
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