/usr/include/trilinos/Galeri_Hanowa.h is in libtrilinos-galeri-dev 12.4.2-2.
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// ************************************************************************
//
// Galeri: Finite Element and Matrix Generation Package
// Copyright (2006) ETHZ/Sandia Corporation
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#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 {
template<typename int_type>
inline
Epetra_CrsMatrix* Hanowa(const Epetra_Map* Map, const double value)
{
int NumMyElements = Map->NumMyElements();
int_type NumGlobalElements = (int_type) Map->NumGlobalElements64();
int_type* MyGlobalElements = 0;
Map->MyGlobalElementsPtr(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_type Indices[2];
int_type half = NumGlobalElements / 2;
for (int i = 0 ; i < NumMyElements ; ++i)
{
int NumEntries = 2;
int_type 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);
}
Epetra_CrsMatrix* Hanowa(const Epetra_Map* Map, const double value)
{
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
if(Map->GlobalIndicesInt()) {
return Hanowa<int>(Map, value);
}
else
#endif
#ifndef EPETRA_NO_64BIT_GLOBAL_INDICES
if(Map->GlobalIndicesLongLong()) {
return Hanowa<long long>(Map, value);
}
else
#endif
throw "Galeri::Matrices::Hanowa: GlobalIndices type unknown";
}
} // namespace Matrices
} // namespace Galeri
#endif
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