/usr/include/trilinos/Galeri_Fielder.h is in libtrilinos-galeri-dev 12.12.1-5.
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// ************************************************************************
//
// Galeri: Finite Element and Matrix Generation Package
// Copyright (2006) ETHZ/Sandia Corporation
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#ifndef GALERI_FIEDLER_H
#define GALERI_FIEDLER_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* Fielder(const Epetra_Map* Map)
{
// this is actually a dense matrix, stored into Crs format
int_type NumGlobalElements = (int_type) Map->NumGlobalElements64();
int NumMyElements = Map->NumMyElements();
int_type* MyGlobalElements = 0;
Map->MyGlobalElementsPtr(MyGlobalElements);
Epetra_CrsMatrix* Matrix = new Epetra_CrsMatrix(Copy, *Map, NumGlobalElements);
std::vector<double> Values(NumGlobalElements);
std::vector<int_type> Indices(NumGlobalElements);
for (int i = 0 ; i < NumMyElements ; ++i)
{
int_type NumEntries = NumGlobalElements;
int_type iGlobal = MyGlobalElements[i];
for (int_type j = 0 ; j < NumGlobalElements ; ++j)
{
Indices[j] = j;
Values[j] = (double)abs((double) (iGlobal - j));
}
Matrix->InsertGlobalValues(MyGlobalElements[i], NumEntries,
&Values[0], &Indices[0]);
}
// 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* Fielder(const Epetra_Map* Map)
{
#ifndef EPETRA_NO_32BIT_GLOBAL_INDICES
if(Map->GlobalIndicesInt()) {
return Fielder<int>(Map);
}
else
#endif
#ifndef EPETRA_NO_64BIT_GLOBAL_INDICES
if(Map->GlobalIndicesLongLong()) {
return Fielder<long long>(Map);
}
else
#endif
throw "Galeri::Matrices::Fielder: GlobalIndices type unknown";
}
} // namespace Matrices
} // namespace Galeri
#endif
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