COIN-OR::LEMON - Graph Library

source: lemon/test/mip_test.cc @ 674:20dac2104519

Last change on this file since 674:20dac2104519 was 674:20dac2104519, checked in by Akos Ladanyi <ladanyi@…>, 11 years ago

Merge and extend the fix of #275

File size: 3.0 KB
Line 
1/* -*- mode: C++; indent-tabs-mode: nil; -*-
2 *
3 * This file is a part of LEMON, a generic C++ optimization library.
4 *
5 * Copyright (C) 2003-2009
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#include "test_tools.h"
20
21#ifdef HAVE_CONFIG_H
22#include <lemon/config.h>
23#endif
24
25#ifdef LEMON_HAVE_CPLEX
26#include <lemon/cplex.h>
27#endif
28
29#ifdef LEMON_HAVE_GLPK
30#include <lemon/glpk.h>
31#endif
32
33#ifdef LEMON_HAVE_CBC
34#include <lemon/cbc.h>
35#endif
36
37
38using namespace lemon;
39
40void solveAndCheck(MipSolver& mip, MipSolver::ProblemType stat,
41                   double exp_opt) {
42  using std::string;
43
44  mip.solve();
45  //int decimal,sign;
46  std::ostringstream buf;
47  buf << "Type should be: " << int(stat)<<" and it is "<<int(mip.type());
48
49
50  //  itoa(stat,buf1, 10);
51  check(mip.type()==stat, buf.str());
52
53  if (stat ==  MipSolver::OPTIMAL) {
54    std::ostringstream sbuf;
55    buf << "Wrong optimal value: the right optimum is " << exp_opt;
56    check(std::abs(mip.solValue()-exp_opt) < 1e-3, sbuf.str());
57    //+ecvt(exp_opt,2)
58  }
59}
60
61void aTest(MipSolver& mip)
62{
63  //The following example is very simple
64
65
66  typedef MipSolver::Row Row;
67  typedef MipSolver::Col Col;
68
69
70  Col x1 = mip.addCol();
71  Col x2 = mip.addCol();
72
73
74  //Objective function
75  mip.obj(x1);
76
77  mip.max();
78
79  //Unconstrained optimization
80  mip.solve();
81  //Check it out!
82
83  //Constraints
84  mip.addRow(2 * x1 + x2 <= 2);
85  Row y2 = mip.addRow(x1 - 2 * x2 <= 0);
86
87  //Nonnegativity of the variable x1
88  mip.colLowerBound(x1, 0);
89
90
91  //Maximization of x1
92  //over the triangle with vertices (0,0),(4/5,2/5),(0,2)
93  double expected_opt=4.0/5.0;
94  solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
95
96
97  //Restrict x2 to integer
98  mip.colType(x2,MipSolver::INTEGER);
99  expected_opt=1.0/2.0;
100  solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
101
102
103  //Restrict both to integer
104  mip.colType(x1,MipSolver::INTEGER);
105  expected_opt=0;
106  solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
107
108  //Erase a variable
109  mip.erase(x2);
110  mip.rowUpperBound(y2, 8);
111  expected_opt=1;
112  solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
113
114}
115
116
117template<class MIP>
118void cloneTest()
119{
120
121  MIP* mip = new MIP();
122  MIP* mipnew = mip->newSolver();
123  MIP* mipclone = mip->cloneSolver();
124  delete mip;
125  delete mipnew;
126  delete mipclone;
127}
128
129int main()
130{
131
132#ifdef LEMON_HAVE_GLPK
133  {
134    GlpkMip mip1;
135    aTest(mip1);
136    cloneTest<GlpkMip>();
137  }
138#endif
139
140#ifdef LEMON_HAVE_CPLEX
141  try {
142    CplexMip mip2;
143    aTest(mip2);
144    cloneTest<CplexMip>();
145  } catch (CplexEnv::LicenseError& error) {
146    check(false, error.what());
147  }
148#endif
149
150#ifdef LEMON_HAVE_CBC
151  {
152    CbcMip mip1;
153    aTest(mip1);
154    cloneTest<CbcMip>();
155  }
156#endif
157
158  return 0;
159
160}
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