/usr/include/trilinos/EpetraExt_TCrsGraph_MapColoringIndex.h is in libtrilinos-epetraext-dev 12.12.1-5.
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// ***********************************************************************
//
// EpetraExt: Epetra Extended - Linear Algebra Services Package
// Copyright (2011) Sandia Corporation
//
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//@HEADER
#ifndef EpetraExt_TCRSGRAPH_MAPCOLORINGINDEX_H
#define EpetraExt_TCRSGRAPH_MAPCOLORINGINDEX_H
#include <EpetraExt_Transform.h>
#include <Epetra_GIDTypeVector.h>
#include <Epetra_MapColoring.h>
#include <vector>
#include <map>
class Epetra_CrsGraph;
class Epetra_IntVector;
namespace EpetraExt {
///
/** Generates a std::vector of Epetra_IntVector's to be used to map perturbation
* contributions to a CrsGraph/CrsMatrix from a perturbed vector.
*/
template<typename int_type>
class TCrsGraph_MapColoringIndex
: public StructuralTransform< Epetra_CrsGraph,std::vector<typename Epetra_GIDTypeVector<int_type>::impl> > {
const Epetra_MapColoring & ColorMap_;
protected:
///
/** Destructor
*/
~TCrsGraph_MapColoringIndex() {}
///
/** Constructor
* input param ColorMap defines the perturbation coloring
*/
TCrsGraph_MapColoringIndex( const Epetra_MapColoring & ColorMap )
: ColorMap_( ColorMap )
{}
public:
typedef StructuralTransform< Epetra_CrsGraph,std::vector<typename Epetra_GIDTypeVector<int_type>::impl> > Base;
///
/** Generates a std::vector<Epetra_IntVector> from the input Epetra_CrsGraph
*/
typedef typename Base::NewTypeRef NewTypeRef;
typedef typename Base::OriginalTypeRef OriginalTypeRef;
NewTypeRef operator()( OriginalTypeRef orig );
};
//////// Implementations ////////
template<typename int_type>
typename TCrsGraph_MapColoringIndex<int_type>::NewTypeRef
TCrsGraph_MapColoringIndex<int_type>::
operator()( OriginalTypeRef orig )
{
if(!orig.RowMap(). template GlobalIndicesIsType<int_type>())
throw "EpetraExt::TCrsGraph_MapColoringIndex::operator(): Global indices mismatch.";
Base::origObj_ = &orig;
const Epetra_BlockMap & RowMap = orig.RowMap();
int nRows = RowMap.NumMyElements();
int NumColors = ColorMap_.NumColors();
int * ListOfColors = ColorMap_.ListOfColors();
std::map<int,int> MapOfColors;
for( int i = 0; i < NumColors; ++i ) MapOfColors[ ListOfColors[i] ] = i;
//initial setup of stl vector of IntVectors for indexing
std::vector<int_type> dummy( nRows, -1 );
typename Base::NewTypePtr IndexVec = new typename Base::NewType( NumColors, typename Epetra_GIDTypeVector<int_type>::impl( Copy, RowMap, &dummy[0] ) );
int MaxNumIndices = orig.MaxNumIndices();
int NumIndices;
std::vector<int_type> Indices( MaxNumIndices );
for( int i = 0; i < nRows; ++i )
{
orig.ExtractGlobalRowCopy( (int_type) orig.GRID64(i), MaxNumIndices, NumIndices, &Indices[0] );
for( int j = 0; j < NumIndices; ++j )
(*IndexVec)[ MapOfColors[ColorMap_(Indices[j])] ][i] = Indices[j];
}
Base::newObj_ = IndexVec;
return *IndexVec;
}
} //namespace EpetraExt
#endif // EpetraExt_TCRSGRAPH_MAPCOLORINGINDEX_H
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