/usr/include/trilinos/Galeri_Interlaced.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_INTERLACED_H
#define GALERI_INTERLACED_H
#include "Galeri_Exception.h"
#include "Epetra_Comm.h"
#include "Epetra_Map.h"
namespace Galeri {
namespace Maps {
inline
Epetra_Map*
Interlaced(Epetra_Comm& Comm, int NumGlobalElements)
{
if (NumGlobalElements <= 0)
throw(Exception(__FILE__, __LINE__,
"Incorrect input parameter to Maps::Interlaced()",
"n = " + toString(NumGlobalElements)));
// this is a funky map. Nodes are assigned so that
// node 0 is given to proc 0, node 1 to proc 1, and
// node i to proc i%NumProcs. Probably not the best, but it
// results in decompositions with lots of boundary nodes.
int NumProcs = Comm.NumProc();
int MyPID = Comm.MyPID();
int NumMyElements = NumGlobalElements / NumProcs;
if (MyPID < NumGlobalElements % NumProcs) NumMyElements++;
int count = 0;
vector<int> MyGlobalElements(NumMyElements);
for (int i = 0 ; i < NumGlobalElements ; ++i)
{
if (i%NumProcs == MyPID)
MyGlobalElements[count++] = i;
}
if (count != NumMyElements)
throw(Exception(__FILE__, __LINE__,
"Something went wrong in Maps::Interlaced()",
"count = " + toString(count)
+ ", NumMyElements = " + toString(NumMyElements)));
return(new Epetra_Map(NumGlobalElements, NumMyElements,
&MyGlobalElements[0], 0, Comm));
} // Interlaced()
} // namespace Maps
} // namespace Galeri
#endif
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