ClpPEDualRowSteepest.hpp

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// Copyright (C) 2002, International Business Machines
// Corporation and others.  All Rights Reserved.
/*
   Authors

   Jeremy Omer

   Last update: april 10, 2015

 */

#ifndef ClpPEDualRowSteepest_H
#define ClpPEDualRowSteepest_H

#include "ClpDualRowSteepest.hpp"
#include "ClpPESimplex.hpp"
class CoinIndexedVector;

//#############################################################################

class ClpPEDualRowSteepest : public ClpDualRowSteepest {

public:
  ClpPEDualRowSteepest(double psi = 0.5, int mode = 3);

  ClpPEDualRowSteepest(const ClpPEDualRowSteepest &);

  ClpPEDualRowSteepest &operator=(const ClpPEDualRowSteepest &rhs);

  virtual ~ClpPEDualRowSteepest();

  virtual ClpDualRowPivot *clone(bool copyData = true) const;

public:


  virtual int pivotRow();

  virtual void saveWeights(ClpSimplex *model, int mode);
  virtual void updatePrimalSolution(CoinIndexedVector *input,
    double theta,
    double &changeInObjective);

  // Psi
  inline double psi() const
  {
    return psi_;
  }

  //---------------------------------------------------------------------------

private:
  /* this PESimplex object is used to identify the compatible variables */
  ClpPESimplex *modelPE_;

  /* psi is the factor used in the bi-dimensional pricing, it is < 1 and
       1/psi grows with the priority given to compatible variables */
  double psi_;

  /* useful counters for the update of the set of compatible variables */
  int iCurrent_;
  int iInterval_;

  /* record if previous iterations concluded that compatibles should not be checked */
  bool updateCompatibles_;
  int coDegenCompatibles_, coConsecutiveCompatibles_;
};

#endif

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