Clp 1.17.5
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ClpPrimalColumnPivot.hpp
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1/* $Id: ClpPrimalColumnPivot.hpp 2385 2019-01-06 19:43:06Z unxusr $ */
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
9class ClpSimplex;
10class CoinIndexedVector;
11
12//#############################################################################
13
26
27public:
29
30
49 virtual int pivotColumn(CoinIndexedVector *updates,
50 CoinIndexedVector *spareRow1,
51 CoinIndexedVector *spareRow2,
52 CoinIndexedVector *spareColumn1,
53 CoinIndexedVector *spareColumn2)
54 = 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 {
78 way = 0;
79 return -2;
80 }
82 virtual void clearArrays();
84 virtual bool looksOptimal() const
85 {
86 return looksOptimal_;
87 }
89 virtual void setLooksOptimal(bool flag)
90 {
91 looksOptimal_ = flag;
92 }
94
96
97
99
102
105
108
110 virtual ClpPrimalColumnPivot *clone(bool copyData = true) const = 0;
111
113
115
116
118 {
119 return model_;
120 }
122 inline void setModel(ClpSimplex *newmodel)
123 {
124 model_ = newmodel;
125 }
126
128 inline int type()
129 {
130 return type_;
131 }
132
136 virtual int numberSprintColumns(int &numberIterations) const;
138 virtual void switchOffSprint();
140 virtual void maximumPivotsChanged() {}
141
143
144 //---------------------------------------------------------------------------
145
146protected:
148
149
152 int type_;
156};
157#ifndef CLP_PRIMAL_SLACK_MULTIPLIER
158#define CLP_PRIMAL_SLACK_MULTIPLIER 1.01
159#endif
160#endif
161
162/* vi: softtabstop=2 shiftwidth=2 expandtab tabstop=2
163*/
Primal Column Pivot Abstract Base Class.
ClpSimplex * model()
Returns model.
virtual int pivotRow(double &way)
Signals pivot row choice: -2 (default) - use normal pivot row choice -1 to numberRows-1 - use this (w...
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...
ClpPrimalColumnPivot(const ClpPrimalColumnPivot &)
Copy constructor.
ClpPrimalColumnPivot & operator=(const ClpPrimalColumnPivot &rhs)
Assignment operator.
virtual ~ClpPrimalColumnPivot()
Destructor.
virtual void switchOffSprint()
Switch off sprint idea.
virtual bool looksOptimal() const
Returns true if would not find any column.
virtual void updateWeights(CoinIndexedVector *input)
Updates weights - part 1 (may be empty)
virtual void maximumPivotsChanged()
Called when maximum pivots changes.
virtual int numberSprintColumns(int &numberIterations) const
Returns number of extra columns for sprint algorithm - 0 means off.
ClpPrimalColumnPivot()
Default Constructor.
virtual ClpPrimalColumnPivot * clone(bool copyData=true) const =0
Clone.
int type()
Returns type (above 63 is extra information)
ClpSimplex * model_
Pointer to model.
virtual int pivotColumn(CoinIndexedVector *updates, CoinIndexedVector *spareRow1, CoinIndexedVector *spareRow2, CoinIndexedVector *spareColumn1, CoinIndexedVector *spareColumn2)=0
Returns pivot column, -1 if none.
int type_
Type of column pivot algorithm.
void setModel(ClpSimplex *newmodel)
Sets model.
virtual void clearArrays()
Gets rid of all arrays (may be empty)
virtual void setLooksOptimal(bool flag)
Sets optimality flag (for advanced use)
bool looksOptimal_
Says if looks optimal (normally computed)
This solves LPs using the simplex method.