Clp 1.17.5
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AbcPrimalColumnPivot.hpp
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1/* $Id: AbcPrimalColumnPivot.hpp 2385 2019-01-06 19:43:06Z unxusr $ */
2// Copyright (C) 2002, International Business Machines
3// Corporation and others, Copyright (C) 2012, FasterCoin. All Rights Reserved.
4// This code is licensed under the terms of the Eclipse Public License (EPL).
5
6#ifndef AbcPrimalColumnPivot_H
7#define AbcPrimalColumnPivot_H
8#include "AbcCommon.hpp"
9
10class AbcSimplex;
11class CoinIndexedVector;
12
13//#############################################################################
14
27
28public:
30
31
50 virtual int pivotColumn(CoinPartitionedVector *updates,
51 CoinPartitionedVector *spareRow2,
52 CoinPartitionedVector *spareColumn1)
53 = 0;
54
56 virtual void updateWeights(CoinIndexedVector *input);
57
69 virtual void saveWeights(AbcSimplex *model, int mode) = 0;
75 virtual int pivotRow(double &way)
76 {
77 way = 0;
78 return -2;
79 }
81 virtual void clearArrays();
83 virtual bool looksOptimal() const
84 {
85 return looksOptimal_;
86 }
88 virtual void setLooksOptimal(bool flag)
89 {
90 looksOptimal_ = flag;
91 }
93
95
96
98
101
104
107
109 virtual AbcPrimalColumnPivot *clone(bool copyData = true) const = 0;
110
112
114
115
117 {
118 return model_;
119 }
121 inline void setModel(AbcSimplex *newmodel)
122 {
123 model_ = newmodel;
124 }
125
127 inline int type()
128 {
129 return type_;
130 }
131
135 virtual int numberSprintColumns(int &numberIterations) const;
137 virtual void switchOffSprint();
139 virtual void maximumPivotsChanged() {}
140
142
143 //---------------------------------------------------------------------------
144
145protected:
147
148
151 int type_;
155};
156#ifndef CLP_PRIMAL_SLACK_MULTIPLIER
157#define CLP_PRIMAL_SLACK_MULTIPLIER 1.01
158#endif
159#endif
160
161/* vi: softtabstop=2 shiftwidth=2 expandtab tabstop=2
162*/
Primal Column Pivot Abstract Base Class.
int type_
Type of column pivot algorithm.
virtual void setLooksOptimal(bool flag)
Sets optimality flag (for advanced use)
virtual void switchOffSprint()
Switch off sprint idea.
virtual int pivotRow(double &way)
Signals pivot row choice: -2 (default) - use normal pivot row choice -1 to numberRows-1 - use this (w...
virtual AbcPrimalColumnPivot * clone(bool copyData=true) const =0
Clone.
virtual void saveWeights(AbcSimplex *model, int mode)=0
Saves any weights round factorization as pivot rows may change Will be empty unless steepest edge (wi...
bool looksOptimal_
Says if looks optimal (normally computed)
virtual int numberSprintColumns(int &numberIterations) const
Returns number of extra columns for sprint algorithm - 0 means off.
AbcPrimalColumnPivot & operator=(const AbcPrimalColumnPivot &rhs)
Assignment operator.
void setModel(AbcSimplex *newmodel)
Sets model.
virtual void updateWeights(CoinIndexedVector *input)
Updates weights - part 1 (may be empty)
AbcSimplex * model()
Returns model.
virtual void maximumPivotsChanged()
Called when maximum pivots changes.
AbcPrimalColumnPivot()
Default Constructor.
virtual bool looksOptimal() const
Returns true if would not find any column.
AbcSimplex * model_
Pointer to model.
virtual void clearArrays()
Gets rid of all arrays (may be empty)
int type()
Returns type (above 63 is extra information)
AbcPrimalColumnPivot(const AbcPrimalColumnPivot &)
Copy constructor.
virtual ~AbcPrimalColumnPivot()
Destructor.
virtual int pivotColumn(CoinPartitionedVector *updates, CoinPartitionedVector *spareRow2, CoinPartitionedVector *spareColumn1)=0
Returns pivot column, -1 if none.