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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_HANOWA_H
#define GALERI_HANOWA_H
#include "Galeri_Exception.h"
#include "Epetra_Comm.h"
#include "Epetra_BlockMap.h"
#include "Epetra_CrsMatrix.h"
namespace Galeri {
namespace Matrices {
inline
Epetra_CrsMatrix* Hanowa(const Epetra_Map* Map, const double value)
{
int NumMyElements = Map->NumMyElements();
int NumGlobalElements = Map->NumGlobalElements();
int* MyGlobalElements = Map->MyGlobalElements();
if (NumGlobalElements % 2)
throw(Exception(__FILE__, __LINE__,
"`hanowa' matrix requires a even number of points"));
Epetra_CrsMatrix* Matrix = new Epetra_CrsMatrix(Copy, *Map, 2);
double Values[2];
int Indices[2];
int half = NumGlobalElements / 2;
for (int i = 0 ; i < NumMyElements ; ++i)
{
int NumEntries = 2;
int Global = MyGlobalElements[i];
Indices[0] = Global;
if (Global < half) Indices[1] = Global + half;
else Indices[1] = Global - half;
Values[0] = value;
// convert from C style to FORTRAN style
if (Global < half) Values[1] = (double) -Global - 1;
else Values[1] = (double) (Global - half) + 1;
Matrix->InsertGlobalValues(MyGlobalElements[i], NumEntries,
Values, Indices);
}
// Finish up, trasforming the matrix entries into local numbering,
// to optimize data transfert during matrix-vector products
Matrix->FillComplete();
Matrix->OptimizeStorage();
return(Matrix);
}
} // namespace Matrices
} // namespace Galeri
#endif
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