EpetraExt_View_CrsMatrix.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_View_CrsMatrix.h>
00030 
00031 #include <Epetra_CrsGraph.h>
00032 #include <Epetra_CrsMatrix.h>
00033 
00034 namespace EpetraExt {
00035 
00036 CrsMatrix_View::
00037 ~CrsMatrix_View()
00038 {
00039   if( newObj_ ) delete newObj_;
00040 }
00041 
00042 CrsMatrix_View::NewTypeRef
00043 CrsMatrix_View::
00044 operator()( OriginalTypeRef orig )
00045 {
00046   origObj_ = &orig;
00047 
00048   if( orig.IndicesAreGlobal() ) cout << "EDT_CrsMatrix_View: Indices must be LOCAL!\n";
00049   assert( !orig.IndicesAreGlobal() );
00050 
00051   //test graph, new graph must be contiguous subset of old
00052 
00053   //intial construction of matrix 
00054   Epetra_CrsMatrix * newMatrix( new Epetra_CrsMatrix( View, NewGraph_ ) );
00055 
00056   //insert views of row values
00057   int * myIndices;
00058   double * myValues;
00059   int indicesCnt;
00060   int numMyRows = newMatrix->NumMyRows();
00061   for( int i = 0; i < numMyRows; ++i )
00062   {
00063     orig.ExtractMyRowView( i, indicesCnt, myValues, myIndices );
00064 
00065     int newIndicesCnt = indicesCnt;
00066     bool done = false;
00067     for( int j = 0; j < indicesCnt; ++j )
00068       if( !done && NewGraph_.GCID( myIndices[j] ) == -1 )
00069       {
00070         newIndicesCnt = j;
00071         done = true;
00072       }
00073 
00074     newMatrix->InsertMyValues( i, newIndicesCnt, myValues, myIndices );
00075   }
00076 
00077   newMatrix->FillComplete();
00078 
00079   newObj_ = newMatrix;
00080 
00081   return *newMatrix;
00082 }
00083 
00084 } // namespace EpetraExt
00085 

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