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ClpDualRowPivot.hpp
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1 /* $Id: ClpDualRowPivot.hpp 2070 2014-11-18 11:12:54Z forrest $ */
2 // Copyright (C) 2002, International Business Machines
3 // Corporation and others. All Rights Reserved.
4 // This code is licensed under the terms of the Eclipse Public License (EPL).
5 
6 #ifndef ClpDualRowPivot_H
7 #define ClpDualRowPivot_H
8 
9 class ClpSimplex;
10 class CoinIndexedVector;
11 
12 //#############################################################################
13 
23 
24 public:
25 
27 
28 
30  virtual int pivotRow() = 0;
31 
34  virtual double updateWeights(CoinIndexedVector * input,
35  CoinIndexedVector * spare,
36  CoinIndexedVector * spare2,
37  CoinIndexedVector * updatedColumn) = 0;
38 
45  /* FIXME: this was pure virtul (=0). Why? */
46  virtual void updatePrimalSolution(CoinIndexedVector * input,
47  double theta,
48  double & changeInObjective) = 0;
61  virtual void saveWeights(ClpSimplex * model, int mode);
63  virtual void checkAccuracy();
65  virtual void unrollWeights();
67  virtual void clearArrays();
69  virtual bool looksOptimal() const {
70  return false;
71  }
73  virtual void maximumPivotsChanged() {}
75 
76 
78 
81 
84 
87 
89  virtual ~ClpDualRowPivot ();
90 
92  virtual ClpDualRowPivot * clone(bool copyData = true) const = 0;
93 
95 
97 
98  inline ClpSimplex * model() {
100  return model_;
101  }
102 
104  inline void setModel(ClpSimplex * newmodel) {
105  model_ = newmodel;
106  }
107 
109  inline int type() {
110  return type_;
111  }
112 
114 
115  //---------------------------------------------------------------------------
116 
117 protected:
119 
120  ClpSimplex * model_;
123  int type_;
125 };
126 #ifndef CLP_DUAL_COLUMN_MULTIPLIER
127 //#define CLP_DUAL_COLUMN_MULTIPLIER 0.99999
128 #endif
129 #endif
virtual ClpDualRowPivot * clone(bool copyData=true) const =0
Clone.
virtual double updateWeights(CoinIndexedVector *input, CoinIndexedVector *spare, CoinIndexedVector *spare2, CoinIndexedVector *updatedColumn)=0
Updates weights and returns pivot alpha.
void setModel(ClpSimplex *newmodel)
Sets model (normally to NULL)
ClpSimplex * model_
Pointer to model.
ClpDualRowPivot()
Default Constructor.
This solves LPs using the simplex method.
Definition: ClpSimplex.hpp:70
Indexed Vector.
virtual void clearArrays()
Gets rid of all arrays (may be empty)
virtual void saveWeights(ClpSimplex *model, int mode)
Saves any weights round factorization as pivot rows may change Will be empty unless steepest edge (wi...
virtual void updatePrimalSolution(CoinIndexedVector *input, double theta, double &changeInObjective)=0
Updates primal solution (and maybe list of candidates) Uses input vector which it deletes Computes ch...
virtual void checkAccuracy()
checks accuracy and may re-initialize (may be empty)
virtual ~ClpDualRowPivot()
Destructor.
virtual void maximumPivotsChanged()
Called when maximum pivots changes.
virtual bool looksOptimal() const
Returns true if would not find any row.
int type()
Returns type (above 63 is extra information)
int type_
Type of row pivot algorithm.
Dual Row Pivot Abstract Base Class.
virtual void unrollWeights()
Gets rid of last update (may be empty)
ClpDualRowPivot & operator=(const ClpDualRowPivot &rhs)
Assignment operator.
virtual int pivotRow()=0
Returns pivot row, -1 if none.
ClpSimplex * model()
Returns model.