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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_CROSS3D_H
#define GALERI_CROSS3D_H
#include "Galeri_Exception.h"
#include "Galeri_Utils.h"
#include "Epetra_Comm.h"
#include "Epetra_BlockMap.h"
#include "Epetra_CrsMatrix.h"
namespace Galeri {
namespace Matrices {
inline
Epetra_CrsMatrix*
Cross3D(const Epetra_Map* Map,
const int nx, const int ny, const int nz,
const double a, const double b, const double c,
const double d, const double e, const double f,
const double g)
{
Epetra_CrsMatrix* Matrix = new Epetra_CrsMatrix(Copy, *Map, 7);
int NumMyElements = Map->NumMyElements();
int* MyGlobalElements = Map->MyGlobalElements();
int left, right, lower, upper, below, above;
vector<double> Values(6);
vector<int> Indices(6);
// e
// b a c
// d
// + f below and g above
for (int i = 0 ; i < NumMyElements ; ++i)
{
int NumEntries = 0;
GetNeighboursCartesian3d(MyGlobalElements[i], nx, ny, nz,
left, right, lower, upper, below, above);
if (left != -1)
{
Indices[NumEntries] = left;
Values[NumEntries] = b;
++NumEntries;
}
if (right != -1)
{
Indices[NumEntries] = right;
Values[NumEntries] = c;
++NumEntries;
}
if (lower != -1)
{
Indices[NumEntries] = lower;
Values[NumEntries] = d;
++NumEntries;
}
if (upper != -1)
{
Indices[NumEntries] = upper;
Values[NumEntries] = e;
++NumEntries;
}
if (below != -1)
{
Indices[NumEntries] = below;
Values[NumEntries] = f;
++NumEntries;
}
if (above != -1)
{
Indices[NumEntries] = above;
Values[NumEntries] = g;
++NumEntries;
}
// put the off-diagonal entries
Matrix->InsertGlobalValues(MyGlobalElements[i], NumEntries,
&Values[0], &Indices[0]);
// Put in the diagonal entry
double diag = a;
Matrix->InsertGlobalValues(MyGlobalElements[i], 1,
&diag, MyGlobalElements + i);
}
Matrix->FillComplete();
Matrix->OptimizeStorage();
return(Matrix);
}
} // namespace Matrices
} // namespace Galeri
#endif
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