ClpPEPrimalColumnSteepest.hpp

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// Copyright (C) 2002, International Business Machines
// Corporation and others.  All Rights Reserved.
/*
   Authors
 
   Jeremy Omer, Mehdi Towhidi
 
   Last update: april 10, 2015
 
 */
 
#ifndef ClpPEPrimalColumnSteepest_H
#define ClpPEPrimalColumnSteepest_H
 
#include "ClpPrimalColumnSteepest.hpp"
#include "ClpFactorization.hpp"
#include "ClpPESimplex.hpp"
#include <bitset>
 
//#############################################################################
class CoinIndexedVector;

 
class ClpPEPrimalColumnSteepest : public ClpPrimalColumnSteepest {
public:


  ClpPEPrimalColumnSteepest(double psi = 0.5, int mode = 3);

  ClpPEPrimalColumnSteepest(const ClpPEPrimalColumnSteepest &rhs);

  ClpPEPrimalColumnSteepest &operator=(const ClpPEPrimalColumnSteepest &rhs);

  virtual ~ClpPEPrimalColumnSteepest();

  virtual ClpPrimalColumnPivot *clone(bool copyData = true) const;
 
public:


  virtual int pivotColumn(CoinIndexedVector *updates,
    CoinIndexedVector *spareRow1,
    CoinIndexedVector *spareRow2,
    CoinIndexedVector *spareColumn1,
    CoinIndexedVector *spareColumn2);


  virtual void saveWeights(ClpSimplex *model, int mode);
  virtual void updateWeights(CoinIndexedVector *input);
  //---------------------------------------------------------------------------
  // 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 */
  int coDegenCompatibles_;
  int coConsecutiveCompatibles_;
  bool updateCompatibles_;
};
 
#endif
 
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