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EpetraExt_View_CrsMatrix.cpp
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00004 //     EpetraExt: Epetra Extended - Linear Algebra Services Package
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00041 
00042 #include <EpetraExt_View_CrsMatrix.h>
00043 
00044 #include <Epetra_CrsGraph.h>
00045 #include <Epetra_CrsMatrix.h>
00046 
00047 namespace EpetraExt {
00048 
00049 CrsMatrix_View::
00050 ~CrsMatrix_View()
00051 {
00052   if( newObj_ ) delete newObj_;
00053 }
00054 
00055 CrsMatrix_View::NewTypeRef
00056 CrsMatrix_View::
00057 operator()( OriginalTypeRef orig )
00058 {
00059   origObj_ = &orig;
00060 
00061   if( orig.IndicesAreGlobal() ) cout << "EDT_CrsMatrix_View: Indices must be LOCAL!\n";
00062   assert( !orig.IndicesAreGlobal() );
00063 
00064   //test graph, new graph must be contiguous subset of old
00065 
00066   //intial construction of matrix 
00067   Epetra_CrsMatrix * newMatrix( new Epetra_CrsMatrix( View, NewGraph_ ) );
00068 
00069   //insert views of row values
00070   int * myIndices;
00071   double * myValues;
00072   int indicesCnt;
00073   int numMyRows = newMatrix->NumMyRows();
00074   for( int i = 0; i < numMyRows; ++i )
00075   {
00076     orig.ExtractMyRowView( i, indicesCnt, myValues, myIndices );
00077 
00078     int newIndicesCnt = indicesCnt;
00079     bool done = false;
00080     for( int j = 0; j < indicesCnt; ++j )
00081       if( !done && NewGraph_.GCID( myIndices[j] ) == -1 )
00082       {
00083         newIndicesCnt = j;
00084         done = true;
00085       }
00086 
00087     newMatrix->InsertMyValues( i, newIndicesCnt, myValues, myIndices );
00088   }
00089 
00090   newMatrix->FillComplete(false);
00091 
00092   newObj_ = newMatrix;
00093 
00094   return *newMatrix;
00095 }
00096 
00097 } // namespace EpetraExt
00098 
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