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EpetraExt_MapColoringIndex.cpp
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00001 //@HEADER
00002 // ***********************************************************************
00003 // 
00004 //     EpetraExt: Epetra Extended - Linear Algebra Services Package
00005 //                 Copyright (2001) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ***********************************************************************
00027 //@HEADER
00028 
00029 #include <EpetraExt_MapColoringIndex.h>
00030 
00031 #include <Epetra_CrsGraph.h>
00032 #include <Epetra_MapColoring.h>
00033 #include <Epetra_IntVector.h>
00034 #include <Epetra_Map.h>
00035 
00036 #include <vector>
00037 #include <map>
00038 
00039 using std::vector;
00040 using std::map;
00041 
00042 namespace EpetraExt {
00043 
00044 CrsGraph_MapColoringIndex::NewTypeRef
00045 CrsGraph_MapColoringIndex::
00046 operator()( OriginalTypeRef orig )
00047 {
00048   origObj_ = &orig;
00049 
00050   const Epetra_BlockMap & RowMap = orig.RowMap();
00051   int nRows = RowMap.NumMyElements();
00052 
00053   int NumColors = ColorMap_.NumColors();
00054   int * ListOfColors = ColorMap_.ListOfColors();
00055 
00056   map<int,int> MapOfColors;
00057   for( int i = 0; i < NumColors; ++i ) MapOfColors[ ListOfColors[i] ] = i;
00058 
00059   //initial setup of stl vector of IntVectors for indexing
00060   vector<int> dummy( nRows, -1 );
00061   NewTypePtr IndexVec = new NewType( NumColors, Epetra_IntVector( Copy, RowMap, &dummy[0] ) );
00062 
00063   int MaxNumIndices = orig.MaxNumIndices();
00064   int NumIndices;
00065   vector<int> Indices( MaxNumIndices );
00066 
00067   for( int i = 0; i < nRows; ++i )
00068   {
00069     orig.ExtractGlobalRowCopy( orig.GRID(i), MaxNumIndices, NumIndices, &Indices[0] );
00070 
00071     for( int j = 0; j < NumIndices; ++j )
00072      (*IndexVec)[ MapOfColors[ColorMap_(Indices[j])] ][i] = Indices[j];
00073   }
00074 
00075   newObj_ = IndexVec;
00076 
00077   return *IndexVec;
00078 }
00079 
00080 } // namespace EpetraExt
00081 
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