EpetraExt_Scale_LinearProblem.h

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// 
//     EpetraExt: Epetra Extended - Linear Algebra Services Package
//                 Copyright (2001) Sandia Corporation
// 
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
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// This library is free software; you can redistribute it and/or modify
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#ifndef EpetraExt_LINEARPROBLEM_SCALE_H
#define EpetraExt_LINEARPROBLEM_SCALE_H

#include <vector>

#include <EpetraExt_Transform.h>

class Epetra_LinearProblem;
class Epetra_Vector;

namespace EpetraExt {


class LinearProblem_Scale : public InPlaceTransform<Epetra_LinearProblem>
{
 public:

  enum ScaleType{ Sum, Max, Diag, None };


  ~LinearProblem_Scale();


  LinearProblem_Scale( ScaleType left = Sum,
                       ScaleType right = Sum,
                       double exp_fac = 1.0,
                       int iterations = 1 )
  : lScale_(left),
    rScale_(right),
    expFac_(exp_fac),
    iters_(iterations),
    scaled_(false)
  {}


  bool fwd();


  bool rvs();

 private:

  const ScaleType lScale_;
  const ScaleType rScale_;

  const double expFac_;

  const int iters_;

  bool scaled_;

  std::vector<Epetra_Vector*> lScaleVecs_;
  std::vector<Epetra_Vector*> rScaleVecs_;
};

} //namespace EpetraExt

#endif //EpetraExt_LINEARPROBLEM_SCALE_H

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