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ClpPrimalColumnPivot.hpp
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1 /* $Id: ClpPrimalColumnPivot.hpp 1732 2011-05-31 08:09:41Z 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 ClpPrimalcolumnPivot_H
7 #define ClpPrimalcolumnPivot_H
8 
9 class ClpSimplex;
10 class CoinIndexedVector;
11 
12 //#############################################################################
13 
26 
27 public:
28 
30 
31 
50  virtual int pivotColumn(CoinIndexedVector * updates,
51  CoinIndexedVector * spareRow1,
52  CoinIndexedVector * spareRow2,
53  CoinIndexedVector * spareColumn1,
54  CoinIndexedVector * spareColumn2) = 0;
55 
57  virtual void updateWeights(CoinIndexedVector * input);
58 
70  virtual void saveWeights(ClpSimplex * model, int mode) = 0;
76  virtual int pivotRow(double & way) {
77  way = 0;
78  return -2;
79  }
81  virtual void clearArrays();
83  virtual bool looksOptimal() const {
84  return looksOptimal_;
85  }
87  virtual void setLooksOptimal(bool flag) {
88  looksOptimal_ = flag;
89  }
91 
92 
94 
97 
100 
103 
105  virtual ~ClpPrimalColumnPivot ();
106 
108  virtual ClpPrimalColumnPivot * clone(bool copyData = true) const = 0;
109 
111 
113 
114  inline ClpSimplex * model() {
116  return model_;
117  }
119  inline void setModel(ClpSimplex * newmodel) {
120  model_ = newmodel;
121  }
122 
124  inline int type() {
125  return type_;
126  }
127 
131  virtual int numberSprintColumns(int & numberIterations) const;
133  virtual void switchOffSprint();
135  virtual void maximumPivotsChanged() {}
136 
138 
139  //---------------------------------------------------------------------------
140 
141 protected:
143 
144  ClpSimplex * model_;
147  int type_;
151 };
152 #ifndef CLP_PRIMAL_SLACK_MULTIPLIER
153 #define CLP_PRIMAL_SLACK_MULTIPLIER 1.01
154 #endif
155 #endif
virtual void maximumPivotsChanged()
Called when maximum pivots changes.
ClpSimplex * model_
Pointer to model.
Primal Column Pivot Abstract Base Class.
virtual void saveWeights(ClpSimplex *model, int mode)=0
Saves any weights round factorization as pivot rows may change Will be empty unless steepest edge (wi...
virtual void clearArrays()
Gets rid of all arrays (may be empty)
bool looksOptimal_
Says if looks optimal (normally computed)
virtual void switchOffSprint()
Switch off sprint idea.
ClpPrimalColumnPivot & operator=(const ClpPrimalColumnPivot &rhs)
Assignment operator.
virtual void updateWeights(CoinIndexedVector *input)
Updates weights - part 1 (may be empty)
virtual ClpPrimalColumnPivot * clone(bool copyData=true) const =0
Clone.
virtual int pivotRow(double &way)
Signals pivot row choice: -2 (default) - use normal pivot row choice -1 to numberRows-1 - use this (w...
int type()
Returns type (above 63 is extra information)
This solves LPs using the simplex method.
Definition: ClpSimplex.hpp:70
Indexed Vector.
virtual int pivotColumn(CoinIndexedVector *updates, CoinIndexedVector *spareRow1, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)=0
Returns pivot column, -1 if none.
virtual void setLooksOptimal(bool flag)
Sets optimality flag (for advanced use)
ClpPrimalColumnPivot()
Default Constructor.
virtual int numberSprintColumns(int &numberIterations) const
Returns number of extra columns for sprint algorithm - 0 means off.
virtual bool looksOptimal() const
Returns true if would not find any column.
ClpSimplex * model()
Returns model.
virtual ~ClpPrimalColumnPivot()
Destructor.
int type_
Type of column pivot algorithm.
void setModel(ClpSimplex *newmodel)
Sets model.