Files @ r689:111698359429

Location: LEMON/LEMON-official/test/mip_test.cc

Load file history 
r689:111698359429
3.0 KiB
text/x-c++src
Show annotation Show as raw Download as raw
gravatar
kpeter (Peter Kovacs)
Less map copying in NetworkSimplex (#234) - The graph is copied in the constructor instead of the init() function. It must not be modified after the class is constructed. - The maps are copied once (instead of twice). - Remove FlowMap, PotentialMap typedefs and flowMap(), pontentialMap() setter functions. - flowMap() and potentialMap() query functions copy the values into the given map (reference) instead of returning a const reference to a previously constructed map.
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
/* -*- mode: C++; indent-tabs-mode: nil; -*-

 *

 * This file is a part of LEMON, a generic C++ optimization library.

 *

 * Copyright (C) 2003-2009

 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

 * (Egervary Research Group on Combinatorial Optimization, EGRES).

 *

 * Permission to use, modify and distribute this software is granted

 * provided that this copyright notice appears in all copies. For

 * precise terms see the accompanying LICENSE file.

 *

 * This software is provided "AS IS" with no warranty of any kind,

 * express or implied, and with no claim as to its suitability for any

 * purpose.

 *

 */



#include "test_tools.h"



#ifdef HAVE_CONFIG_H

#include <lemon/config.h>

#endif



#ifdef HAVE_CPLEX

#include <lemon/cplex.h>

#endif



#ifdef HAVE_GLPK

#include <lemon/glpk.h>

#endif



#ifdef HAVE_CBC

#include <lemon/cbc.h>

#endif





using namespace lemon;



void solveAndCheck(MipSolver& mip, MipSolver::ProblemType stat,

                   double exp_opt) {

  using std::string;



  mip.solve();

  //int decimal,sign;

  std::ostringstream buf;

  buf << "Type should be: " << int(stat)<<" and it is "<<int(mip.type());





  //  itoa(stat,buf1, 10);

  check(mip.type()==stat, buf.str());



  if (stat ==  MipSolver::OPTIMAL) {

    std::ostringstream sbuf;

    buf << "Wrong optimal value: the right optimum is " << exp_opt;

    check(std::abs(mip.solValue()-exp_opt) < 1e-3, sbuf.str());

    //+ecvt(exp_opt,2)

  }

}



void aTest(MipSolver& mip)

{

  //The following example is very simple





  typedef MipSolver::Row Row;

  typedef MipSolver::Col Col;





  Col x1 = mip.addCol();

  Col x2 = mip.addCol();





  //Objective function

  mip.obj(x1);



  mip.max();



  //Unconstrained optimization

  mip.solve();

  //Check it out!



  //Constraints

  mip.addRow(2 * x1 + x2 <= 2);

  Row y2 = mip.addRow(x1 - 2 * x2 <= 0);



  //Nonnegativity of the variable x1

  mip.colLowerBound(x1, 0);





  //Maximization of x1

  //over the triangle with vertices (0,0),(4/5,2/5),(0,2)

  double expected_opt=4.0/5.0;

  solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);





  //Restrict x2 to integer

  mip.colType(x2,MipSolver::INTEGER);

  expected_opt=1.0/2.0;

  solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);





  //Restrict both to integer

  mip.colType(x1,MipSolver::INTEGER);

  expected_opt=0;

  solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);



  //Erase a variable

  mip.erase(x2);

  mip.rowUpperBound(y2, 8);

  expected_opt=1;

  solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);



}





template<class MIP>

void cloneTest()

{



  MIP* mip = new MIP();

  MIP* mipnew = mip->newSolver();

  MIP* mipclone = mip->cloneSolver();

  delete mip;

  delete mipnew;

  delete mipclone;

}



int main()

{



#ifdef HAVE_GLPK

  {

    GlpkMip mip1;

    aTest(mip1);

    cloneTest<GlpkMip>();

  }

#endif



#ifdef HAVE_CPLEX

  try {

    CplexMip mip2;

    aTest(mip2);

    cloneTest<CplexMip>();

  } catch (CplexEnv::LicenseError& error) {

    check(false, error.what());

  }

#endif



#ifdef HAVE_CBC

  {

    CbcMip mip1;

    aTest(mip1);

    cloneTest<CbcMip>();

  }

#endif



  return 0;



}