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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_CARTESIAN2D_H
#define GALERI_CARTESIAN2D_H
#include "Galeri_Exception.h"
#include "Galeri_Utils.h"
#include "Epetra_Comm.h"
#include "Epetra_Map.h"
namespace Galeri {
namespace Maps {
inline
Epetra_Map*
Cartesian2D(const Epetra_Comm& Comm, const int nx, const int ny,
const int mx, const int my)
{
if (nx <= 0 || ny <= 0 || mx <= 0 || my <= 0 || (mx > nx) || (my > ny))
throw(Exception(__FILE__, __LINE__,
"Incorrect input parameter to Maps::Cartesian2D()",
"nx = " + toString(nx) +
", ny = " + toString(ny) +
", mx = " + toString(mx) +
", my = " + toString(my)));
int MyPID = Comm.MyPID(), startx, starty, endx, endy;
int xpid = MyPID % mx;
int ypid = MyPID / mx;
int PerProcSmallXDir = (int) (((double) nx)/((double) mx));
int PerProcSmallYDir = (int) (((double) ny)/((double) my));
int NBigXDir = nx - PerProcSmallXDir*mx;
int NBigYDir = ny - PerProcSmallYDir*my;
if (xpid < NBigXDir) startx = xpid*(PerProcSmallXDir+1);
else startx = (xpid-NBigXDir)*PerProcSmallXDir +
NBigXDir*(PerProcSmallXDir+1);
endx = startx + PerProcSmallXDir;
if (xpid < NBigXDir) endx++;
if (ypid < NBigYDir) starty = ypid*(PerProcSmallYDir+1);
else starty = (ypid-NBigYDir)*PerProcSmallYDir +
NBigYDir*(PerProcSmallYDir+1);
endy = starty + PerProcSmallYDir;
if ( ypid < NBigYDir) endy++;
int NumMyElements = (endx - startx) * (endy - starty);
vector<int> MyGlobalElements(NumMyElements);
int count = 0;
for (int i = startx ; i < endx ; ++i)
for (int j = starty ; j < endy ; ++j)
MyGlobalElements[count++] = i + j * nx;
return(new Epetra_Map(nx * ny, NumMyElements, &MyGlobalElements[0],
0, Comm));
} // Cartesian2D()
} // namespace BlockMaps
} // namespace Galeri
#endif
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