COIN-OR::LEMON - Graph Library

source: lemon-0.x/lemon/lp_glpk.h @ 2350:eb371753e814

Last change on this file since 2350:eb371753e814 was 2328:b4931ae52069, checked in by athos, 17 years ago

Query functions have been implemented for GLPK (CPLEX breaks at the moment, I guess): These functions include:
retrieving one element of the coeff. matrix
retrieving one element of the obj function
lower bd for a variable
upper bound for a variable
lower and upper bounds for a row (these can not be handled separately at the moment)
direction of the optimization (is_max() function)

File size: 3.6 KB
Line 
1/* -*- C++ -*-
2 *
3 * This file is a part of LEMON, a generic C++ optimization library
4 *
5 * Copyright (C) 2003-2006
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
8 *
9 * Permission to use, modify and distribute this software is granted
10 * provided that this copyright notice appears in all copies. For
11 * precise terms see the accompanying LICENSE file.
12 *
13 * This software is provided "AS IS" with no warranty of any kind,
14 * express or implied, and with no claim as to its suitability for any
15 * purpose.
16 *
17 */
18
19#ifndef LEMON_LP_GLPK_H
20#define LEMON_LP_GLPK_H
21
22///\file
23///\brief Header of the LEMON-GLPK lp solver interface.
24///\ingroup gen_opt_group
25
26#include <lemon/lp_base.h>
27extern "C" {
28#include <glpk.h>
29}
30
31namespace lemon {
32
33
34  /// \brief Interface for the GLPK LP solver
35  ///
36  /// This class implements an interface for the GLPK LP solver.
37  ///\ingroup gen_opt_group
38  class LpGlpk : virtual public LpSolverBase {
39  protected:
40    LPX* lp;
41   
42  public:
43   
44    typedef LpSolverBase Parent;
45   
46    LpGlpk();
47    LpGlpk(const LpGlpk &);
48    ~LpGlpk();
49   
50  protected:
51    virtual LpSolverBase &_newLp();
52    virtual LpSolverBase &_copyLp();
53
54    virtual int _addCol();
55    virtual int _addRow();
56    virtual void _eraseCol(int i);
57    virtual void _eraseRow(int i);
58    virtual void _getColName(int col,       std::string & name);
59    virtual void _setColName(int col, const std::string & name);
60    virtual void _setRowCoeffs(int i, LpRowIterator b, LpRowIterator e);
61    virtual void _setColCoeffs(int i, LpColIterator b, LpColIterator e);
62    virtual void _setCoeff(int row, int col, Value value);
63    virtual Value _getCoeff(int row, int col);
64
65    virtual void _setColLowerBound(int i, Value value);
66    virtual Value _getColLowerBound(int i);
67    virtual void _setColUpperBound(int i, Value value);
68    virtual Value _getColUpperBound(int i);
69
70//     virtual void _setRowLowerBound(int i, Value value);
71//     virtual void _setRowUpperBound(int i, Value value);
72    virtual void _setRowBounds(int i, Value lower, Value upper);
73    virtual void _getRowBounds(int i, Value &lb, Value &ub);
74    virtual void _setObjCoeff(int i, Value obj_coef);
75    virtual Value _getObjCoeff(int i);
76    virtual void _clearObj();
77//     virtual void _setObj(int length,
78//                          int  const * indices,
79//                          Value  const * values ) = 0;
80
81    ///\e
82   
83    ///\todo It should be clarified
84    ///
85    virtual SolveExitStatus _solve();
86    virtual Value _getPrimal(int i);
87    virtual Value _getDual(int i);
88    virtual Value _getPrimalValue();
89    virtual bool _isBasicCol(int i);
90    ///\e
91   
92    ///\todo It should be clarified
93    ///
94    virtual SolutionStatus _getPrimalStatus();
95    virtual SolutionStatus _getDualStatus();
96    virtual ProblemTypes _getProblemType();
97
98    virtual void _setMax();
99    virtual void _setMin();
100
101    virtual bool _isMax();
102
103  public:
104    ///Set the verbosity of the messages
105
106    ///Set the verbosity of the messages
107    ///
108    ///\param m is the level of the messages output by the solver routines.
109    ///The possible values are:
110    ///- 0 --- no output (default value)
111    ///- 1 --- error messages only
112    ///- 2 --- normal output
113    ///- 3 --- full output (includes informational messages)
114    void messageLevel(int m);
115    ///Turns on or off the presolver
116
117    ///Turns on (\c b is \c true) or off (\c b is \c false) the presolver
118    ///
119    ///The presolver is off by default.
120    void presolver(bool b);
121
122    LPX *lpx() {return lp;}
123  };
124} //END OF NAMESPACE LEMON
125
126#endif //LEMON_LP_GLPK_H
127
Note: See TracBrowser for help on using the repository browser.