Clp 1.17.5
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AbcDualRowPivot.hpp
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1/* $Id: AbcDualRowPivot.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 AbcDualRowPivot_H
7#define AbcDualRowPivot_H
8#include "AbcCommon.hpp"
9
10class AbcSimplex;
11class CoinIndexedVector;
12
13//#############################################################################
14
24
25public:
27
28
30 virtual int pivotRow() = 0;
31
34 virtual double updateWeights1(CoinIndexedVector &input, CoinIndexedVector &updateColumn) = 0;
35 virtual void updateWeightsOnly(CoinIndexedVector &input) = 0;
36 virtual double updateWeights(CoinIndexedVector &input, CoinIndexedVector &updateColumn) = 0;
38 virtual void updateWeights2(CoinIndexedVector &input, CoinIndexedVector &updateColumn) = 0;
39
45 virtual void updatePrimalSolution(CoinIndexedVector &updateColumn,
46 double theta)
47 = 0;
48 virtual void updatePrimalSolutionAndWeights(CoinIndexedVector &weightsVector,
49 CoinIndexedVector &updateColumn,
50 double theta);
61 virtual void saveWeights(AbcSimplex *model, int mode);
65 virtual void checkAccuracy();
67 virtual void clearArrays();
69 virtual bool looksOptimal() const
70 {
71 return false;
72 }
74
76
77
79
82
85
88
90 virtual AbcDualRowPivot *clone(bool copyData = true) const = 0;
91
93
95
96
97 inline AbcSimplex *model()
98 {
99 return model_;
100 }
101
103 inline void setModel(AbcSimplex *newmodel)
104 {
105 model_ = newmodel;
106 }
107
109 inline int type()
110 {
111 return type_;
112 }
113
115
116 //---------------------------------------------------------------------------
117
118protected:
120
121
124 int type_;
126};
127#ifndef CLP_DUAL_COLUMN_MULTIPLIER
128//#define CLP_DUAL_COLUMN_MULTIPLIER 0.99999
129#endif
130#endif
131
132/* vi: softtabstop=2 shiftwidth=2 expandtab tabstop=2
133*/
Dual Row Pivot Abstract Base Class.
AbcSimplex * model()
Returns model.
virtual ~AbcDualRowPivot()
Destructor.
void setModel(AbcSimplex *newmodel)
Sets model (normally to NULL)
int type_
Type of row pivot algorithm.
virtual void updateWeights2(CoinIndexedVector &input, CoinIndexedVector &updateColumn)=0
Actually updates weights.
AbcDualRowPivot & operator=(const AbcDualRowPivot &rhs)
Assignment operator.
int type()
Returns type (above 63 is extra information)
AbcSimplex * model_
Pointer to model.
virtual bool looksOptimal() const
Returns true if would not find any row.
virtual double updateWeights1(CoinIndexedVector &input, CoinIndexedVector &updateColumn)=0
Does most of work for weights and returns pivot alpha.
virtual void updateWeightsOnly(CoinIndexedVector &input)=0
virtual double updateWeights(CoinIndexedVector &input, CoinIndexedVector &updateColumn)=0
virtual int pivotRow()=0
Returns pivot row, -1 if none.
virtual AbcDualRowPivot * clone(bool copyData=true) const =0
Clone.
AbcDualRowPivot(const AbcDualRowPivot &)
Copy constructor.
AbcDualRowPivot()
Default Constructor.
virtual void checkAccuracy()
checks accuracy and may re-initialize (may be empty)
virtual void updatePrimalSolutionAndWeights(CoinIndexedVector &weightsVector, CoinIndexedVector &updateColumn, double theta)
virtual void saveWeights(AbcSimplex *model, int mode)
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)
virtual void recomputeInfeasibilities()
Recompute infeasibilities.
virtual void updatePrimalSolution(CoinIndexedVector &updateColumn, double theta)=0
Updates primal solution (and maybe list of candidates) Uses input vector which it deletes Would be fa...