/usr/include/trilinos/Galeri_Cartesian3D.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_CARTESIAN3D_H
#define GALERI_CARTESIAN3D_H
#include "Galeri_Exception.h"
#include "Galeri_Utils.h"
#include "Epetra_Comm.h"
#include "Epetra_Map.h"
namespace Galeri {
namespace Maps {
inline
Epetra_Map*
Cartesian3D(const Epetra_Comm& Comm, const int nx, const int ny, const int nz,
const int mx, const int my, const int mz)
{
if (nx <= 0 || ny <= 0 || nz <= 0 ||
mx <= 0 || my <= 0 || mz <= 0 ||
(mx > nx) || (my > ny) || (mz > nz))
throw(Exception(__FILE__, __LINE__,
"Incorrect input parameter to Maps::Cartesian3D()",
"nx = " + toString(nx) +
", ny = " + toString(ny) +
", nz = " + toString(nz) +
", mx = " + toString(mx) +
", my = " + toString(my) +
", mz = " + toString(mz)));
int MyPID = Comm.MyPID();
int startx, starty, startz, endx, endy, endz;
int mxy = mx * my;
int zpid = MyPID / mxy;
int xpid = (MyPID % mxy) % mx;
int ypid = (MyPID % mxy) / mx;
int PerProcSmallXDir = (int) (((double) nx)/((double) mx));
int PerProcSmallYDir = (int) (((double) ny)/((double) my));
int PerProcSmallZDir = (int) (((double) nz)/((double) mz));
int NBigXDir = nx - PerProcSmallXDir*mx;
int NBigYDir = ny - PerProcSmallYDir*my;
int NBigZDir = nz - PerProcSmallZDir*mz;
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++;
if (zpid < NBigZDir) startz = zpid*(PerProcSmallZDir+1);
else startz = (zpid-NBigZDir)*PerProcSmallZDir +
NBigZDir*(PerProcSmallZDir+1);
endz = startz + PerProcSmallZDir;
if ( zpid < NBigZDir) endz++;
int NumMyElements = (endx - startx) * (endy - starty) * (endz - startz);
vector<int> MyGlobalElements(NumMyElements);
int count = 0;
for (int i = startx ; i < endx ; ++i)
for (int j = starty ; j < endy ; ++j)
for (int k = startz ; k < endz ; ++k)
MyGlobalElements[count++] = i + j * nx +k * (nx * ny);
return(new Epetra_Map (-1, NumMyElements, &MyGlobalElements[0], 0, Comm));
} // Cartesian3D()
} // namespace Maps
} // namespace Galeri
#endif
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