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EpetraExt_MapColoringIndex.cpp
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00004 //     EpetraExt: Epetra Extended - Linear Algebra Services Package
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00041 
00042 #include <EpetraExt_MapColoringIndex.h>
00043 
00044 #include <Epetra_CrsGraph.h>
00045 #include <Epetra_MapColoring.h>
00046 #include <Epetra_IntVector.h>
00047 #include <Epetra_Map.h>
00048 
00049 #include <vector>
00050 #include <map>
00051 
00052 using std::vector;
00053 using std::map;
00054 
00055 namespace EpetraExt {
00056 
00057 CrsGraph_MapColoringIndex::NewTypeRef
00058 CrsGraph_MapColoringIndex::
00059 operator()( OriginalTypeRef orig )
00060 {
00061   origObj_ = &orig;
00062 
00063   const Epetra_BlockMap & RowMap = orig.RowMap();
00064   int nRows = RowMap.NumMyElements();
00065 
00066   int NumColors = ColorMap_.NumColors();
00067   int * ListOfColors = ColorMap_.ListOfColors();
00068 
00069   map<int,int> MapOfColors;
00070   for( int i = 0; i < NumColors; ++i ) MapOfColors[ ListOfColors[i] ] = i;
00071 
00072   //initial setup of stl vector of IntVectors for indexing
00073   vector<int> dummy( nRows, -1 );
00074   NewTypePtr IndexVec = new NewType( NumColors, Epetra_IntVector( Copy, RowMap, &dummy[0] ) );
00075 
00076   int MaxNumIndices = orig.MaxNumIndices();
00077   int NumIndices;
00078   vector<int> Indices( MaxNumIndices );
00079 
00080   for( int i = 0; i < nRows; ++i )
00081   {
00082     orig.ExtractGlobalRowCopy( orig.GRID(i), MaxNumIndices, NumIndices, &Indices[0] );
00083 
00084     for( int j = 0; j < NumIndices; ++j )
00085      (*IndexVec)[ MapOfColors[ColorMap_(Indices[j])] ][i] = Indices[j];
00086   }
00087 
00088   newObj_ = IndexVec;
00089 
00090   return *IndexVec;
00091 }
00092 
00093 } // namespace EpetraExt
00094 
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