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EpetraExt_Scale_LinearProblem.h
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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 #ifndef EpetraExt_LINEARPROBLEM_SCALE_H
00030 #define EpetraExt_LINEARPROBLEM_SCALE_H
00031 
00032 #include <vector>
00033 
00034 #include <EpetraExt_Transform.h>
00035 
00036 class Epetra_LinearProblem;
00037 class Epetra_Vector;
00038 
00039 namespace EpetraExt {
00040 
00042 
00044 class LinearProblem_Scale : public InPlaceTransform<Epetra_LinearProblem>
00045 {
00046  public:
00047 
00048   enum ScaleType{ Sum, Max, Diag, None };
00049 
00051 
00053   ~LinearProblem_Scale();
00054 
00056 
00058   LinearProblem_Scale( ScaleType left = Sum,
00059                        ScaleType right = Sum,
00060                        double exp_fac = 1.0,
00061                        int iterations = 1 )
00062   : lScale_(left),
00063     rScale_(right),
00064     expFac_(exp_fac),
00065     iters_(iterations),
00066     scaled_(false)
00067   {}
00068 
00070 
00072   bool fwd();
00073 
00075 
00077   bool rvs();
00078 
00079  private:
00080 
00081   const ScaleType lScale_;
00082   const ScaleType rScale_;
00083 
00084   const double expFac_;
00085 
00086   const int iters_;
00087 
00088   bool scaled_;
00089 
00090   std::vector<Epetra_Vector*> lScaleVecs_;
00091   std::vector<Epetra_Vector*> rScaleVecs_;
00092 };
00093 
00094 } //namespace EpetraExt
00095 
00096 #endif //EpetraExt_LINEARPROBLEM_SCALE_H
00097 
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