/usr/include/trilinos/Galeri_Cartesian2D.h is in libtrilinos-galeri-dev 12.10.1-3.
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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.
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// 1. Redistributions of source code must retain the above copyright
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// 2. Redistributions in binary form must reproduce the above copyright
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// documentation and/or other materials provided with the distribution.
//
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
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// @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 {
template<typename int_type>
inline
Epetra_Map*
TCartesian2D(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);
std::vector<int_type> MyGlobalElements(NumMyElements);
int count = 0;
for (int i = startx ; i < endx ; ++i)
for (int j = starty ; j < endy ; ++j)
MyGlobalElements[count++] = i + j * nx;
#if !defined(EPETRA_NO_32BIT_GLOBAL_INDICES) || !defined(EPETRA_NO_64BIT_GLOBAL_INDICES)
return(new Epetra_Map(nx * ny, NumMyElements, &MyGlobalElements[0],
0, Comm));
#else
return(new Epetra_Map);
#endif
} // TCartesian2D()
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
Epetra_Map*
Cartesian2D(const Epetra_Comm& Comm, const int nx, const int ny,
const int mx, const int my) {
return TCartesian2D<int>(Comm, nx, ny, mx, my);
}
#endif
#ifndef EPETRA_NO_64BIT_GLOBAL_INDICES
Epetra_Map*
Cartesian2D64(const Epetra_Comm& Comm, const int nx, const int ny,
const int mx, const int my) {
return TCartesian2D<long long>(Comm, nx, ny, mx, my);
}
#endif
} // namespace Maps
} // namespace Galeri
#endif
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