EpetraExt_MapColoringIndex.cpp

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// ***********************************************************************
// 
//     EpetraExt: Epetra Extended - Linear Algebra Services Package
//                 Copyright (2001) 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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// You should have received a copy of the GNU Lesser General Public
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#include <EpetraExt_MapColoringIndex.h>

#include <Epetra_CrsGraph.h>
#include <Epetra_MapColoring.h>
#include <Epetra_IntVector.h>
#include <Epetra_Map.h>

#include <vector>
#include <map>

using std::vector;
using std::map;

namespace EpetraExt {

CrsGraph_MapColoringIndex::NewTypeRef
CrsGraph_MapColoringIndex::
operator()( OriginalTypeRef orig )
{
  origObj_ = &orig;

  const Epetra_BlockMap & RowMap = orig.RowMap();
  int nRows = RowMap.NumMyElements();

  int NumColors = ColorMap_.NumColors();
  int * ListOfColors = ColorMap_.ListOfColors();

  map<int,int> MapOfColors;
  for( int i = 0; i < NumColors; ++i ) MapOfColors[ ListOfColors[i] ] = i;

  //initial setup of stl vector of IntVectors for indexing
  vector<int> dummy( nRows, -1 );
  NewTypePtr IndexVec = new NewType( NumColors, Epetra_IntVector( Copy, RowMap, &dummy[0] ) );

  int MaxNumIndices = orig.MaxNumIndices();
  int NumIndices;
  vector<int> Indices( MaxNumIndices );

  for( int i = 0; i < nRows; ++i )
  {
    orig.ExtractGlobalRowCopy( orig.GRID(i), MaxNumIndices, NumIndices, &Indices[0] );

    for( int j = 0; j < NumIndices; ++j )
     (*IndexVec)[ MapOfColors[ColorMap_(Indices[j])] ][i] = Indices[j];
  }

  newObj_ = IndexVec;

  return *IndexVec;
}

} // namespace EpetraExt

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