deba@458: /* -*- mode: C++; indent-tabs-mode: nil; -*-
deba@458:  *
deba@458:  * This file is a part of LEMON, a generic C++ optimization library.
deba@458:  *
deba@458:  * Copyright (C) 2003-2008
deba@458:  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
deba@458:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
deba@458:  *
deba@458:  * Permission to use, modify and distribute this software is granted
deba@458:  * provided that this copyright notice appears in all copies. For
deba@458:  * precise terms see the accompanying LICENSE file.
deba@458:  *
deba@458:  * This software is provided "AS IS" with no warranty of any kind,
deba@458:  * express or implied, and with no claim as to its suitability for any
deba@458:  * purpose.
deba@458:  *
deba@458:  */
deba@458: 
deba@458: #include "test_tools.h"
deba@458: 
deba@458: 
deba@458: #ifdef HAVE_CONFIG_H
deba@458: #include <lemon/config.h>
deba@458: #endif
deba@458: 
deba@458: #ifdef HAVE_CPLEX
alpar@461: #include <lemon/cplex.h>
deba@458: #endif
deba@458: 
deba@458: #ifdef HAVE_GLPK
alpar@461: #include <lemon/glpk.h>
deba@458: #endif
deba@458: 
deba@458: 
deba@458: using namespace lemon;
deba@458: 
deba@459: void solveAndCheck(MipSolver& mip, MipSolver::ProblemType stat,
deba@458:                    double exp_opt) {
deba@458:   using std::string;
deba@458: 
deba@459:   mip.solve();
deba@458:   //int decimal,sign;
deba@458:   std::ostringstream buf;
deba@459:   buf << "Type should be: " << int(stat)<<" and it is "<<int(mip.type());
deba@458: 
deba@458: 
deba@458:   //  itoa(stat,buf1, 10);
deba@459:   check(mip.type()==stat, buf.str());
deba@458: 
deba@459:   if (stat ==  MipSolver::OPTIMAL) {
deba@458:     std::ostringstream sbuf;
deba@458:     buf << "Wrong optimal value: the right optimum is " << exp_opt;
deba@459:     check(std::abs(mip.solValue()-exp_opt) < 1e-3, sbuf.str());
deba@458:     //+ecvt(exp_opt,2)
deba@458:   }
deba@458: }
deba@458: 
deba@459: void aTest(MipSolver& mip)
deba@458: {
deba@458:  //The following example is very simple
deba@458: 
deba@458: 
deba@459:   typedef MipSolver::Row Row;
deba@459:   typedef MipSolver::Col Col;
deba@458: 
deba@458: 
deba@458: 
deba@458:   Col x1 = mip.addCol();
deba@458:   Col x2 = mip.addCol();
deba@458: 
deba@458: 
deba@458:   //Objective function
deba@458:   mip.obj(x1);
deba@458: 
deba@458:   mip.max();
deba@458: 
deba@458: 
deba@458:   //Unconstrained optimization
deba@458:   mip.solve();
deba@458:   //Check it out!
deba@458: 
deba@458:   //Constraints
deba@458:   mip.addRow(2*x1+x2 <=2);
deba@458:   mip.addRow(x1-2*x2 <=0);
deba@458: 
deba@458:   //Nonnegativity of the variable x1
deba@458:   mip.colLowerBound(x1, 0);
deba@458: 
deba@458:   //Maximization of x1
deba@458:   //over the triangle with vertices (0,0),(4/5,2/5),(0,2)
deba@458:   double expected_opt=4.0/5.0;
deba@459:   solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
deba@458: 
deba@458:   //Restrict x2 to integer
deba@459:   mip.colType(x2,MipSolver::INTEGER);
deba@458:   expected_opt=1.0/2.0;
deba@459:   solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
deba@458: 
deba@458: 
deba@458:   //Restrict both to integer
deba@459:   mip.colType(x1,MipSolver::INTEGER);
deba@458:   expected_opt=0;
deba@459:   solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
deba@458: 
deba@458: 
deba@458: 
deba@458: }
deba@458: 
deba@458: 
deba@458: int main()
deba@458: {
deba@458: 
deba@458: #ifdef HAVE_GLPK
deba@459:   {
alpar@462:     GlpkMip mip1;
deba@459:     aTest(mip1);
deba@459:   }
deba@458: #endif
deba@458: 
deba@458: #ifdef HAVE_CPLEX
deba@459:   try {
alpar@462:     CplexMip mip2;
deba@459:     aTest(mip2);
deba@459:   } catch (CplexEnv::LicenseError& error) {
deba@459: #ifdef LEMON_FORCE_CPLEX_CHECK
deba@459:     check(false, error.what());
deba@459: #else
deba@459:     std::cerr << error.what() << std::endl;
deba@459:     std::cerr << "Cplex license check failed, lp check skipped" << std::endl;
deba@459: #endif
deba@459:   }
deba@458: #endif
deba@458: 
deba@458:   return 0;
deba@458: 
deba@458: }