deba@481: /* -*- mode: C++; indent-tabs-mode: nil; -*-
deba@481:  *
deba@481:  * This file is a part of LEMON, a generic C++ optimization library.
deba@481:  *
deba@598:  * Copyright (C) 2003-2009
deba@481:  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
deba@481:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
deba@481:  *
deba@481:  * Permission to use, modify and distribute this software is granted
deba@481:  * provided that this copyright notice appears in all copies. For
deba@481:  * precise terms see the accompanying LICENSE file.
deba@481:  *
deba@481:  * This software is provided "AS IS" with no warranty of any kind,
deba@481:  * express or implied, and with no claim as to its suitability for any
deba@481:  * purpose.
deba@481:  *
deba@481:  */
deba@481: 
deba@481: #include "test_tools.h"
deba@481: 
deba@481: #ifdef HAVE_CONFIG_H
deba@481: #include <lemon/config.h>
deba@481: #endif
deba@481: 
ladanyi@674: #ifdef LEMON_HAVE_CPLEX
alpar@484: #include <lemon/cplex.h>
deba@481: #endif
deba@481: 
ladanyi@674: #ifdef LEMON_HAVE_GLPK
alpar@484: #include <lemon/glpk.h>
deba@481: #endif
deba@481: 
ladanyi@674: #ifdef LEMON_HAVE_CBC
deba@614: #include <lemon/cbc.h>
deba@614: #endif
deba@614: 
deba@481: 
deba@481: using namespace lemon;
deba@481: 
deba@482: void solveAndCheck(MipSolver& mip, MipSolver::ProblemType stat,
deba@481:                    double exp_opt) {
deba@481:   using std::string;
deba@481: 
deba@482:   mip.solve();
deba@481:   //int decimal,sign;
deba@481:   std::ostringstream buf;
deba@482:   buf << "Type should be: " << int(stat)<<" and it is "<<int(mip.type());
deba@481: 
deba@481: 
deba@481:   //  itoa(stat,buf1, 10);
deba@482:   check(mip.type()==stat, buf.str());
deba@481: 
deba@482:   if (stat ==  MipSolver::OPTIMAL) {
deba@481:     std::ostringstream sbuf;
deba@481:     buf << "Wrong optimal value: the right optimum is " << exp_opt;
deba@482:     check(std::abs(mip.solValue()-exp_opt) < 1e-3, sbuf.str());
deba@481:     //+ecvt(exp_opt,2)
deba@481:   }
deba@481: }
deba@481: 
deba@482: void aTest(MipSolver& mip)
deba@481: {
deba@614:   //The following example is very simple
deba@481: 
deba@481: 
deba@482:   typedef MipSolver::Row Row;
deba@482:   typedef MipSolver::Col Col;
deba@481: 
deba@481: 
deba@481:   Col x1 = mip.addCol();
deba@481:   Col x2 = mip.addCol();
deba@481: 
deba@481: 
deba@481:   //Objective function
deba@481:   mip.obj(x1);
deba@481: 
deba@481:   mip.max();
deba@481: 
deba@481:   //Unconstrained optimization
deba@481:   mip.solve();
deba@481:   //Check it out!
deba@481: 
deba@481:   //Constraints
deba@614:   mip.addRow(2 * x1 + x2 <= 2);
deba@614:   Row y2 = mip.addRow(x1 - 2 * x2 <= 0);
deba@481: 
deba@481:   //Nonnegativity of the variable x1
deba@481:   mip.colLowerBound(x1, 0);
deba@481: 
deba@614: 
deba@481:   //Maximization of x1
deba@481:   //over the triangle with vertices (0,0),(4/5,2/5),(0,2)
deba@481:   double expected_opt=4.0/5.0;
deba@482:   solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
deba@481: 
deba@614: 
deba@481:   //Restrict x2 to integer
deba@482:   mip.colType(x2,MipSolver::INTEGER);
deba@481:   expected_opt=1.0/2.0;
deba@482:   solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
deba@481: 
deba@481: 
deba@481:   //Restrict both to integer
deba@482:   mip.colType(x1,MipSolver::INTEGER);
deba@481:   expected_opt=0;
deba@482:   solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
deba@481: 
deba@614:   //Erase a variable
deba@614:   mip.erase(x2);
deba@614:   mip.rowUpperBound(y2, 8);
deba@614:   expected_opt=1;
deba@614:   solveAndCheck(mip, MipSolver::OPTIMAL, expected_opt);
deba@481: 
deba@481: }
deba@481: 
deba@614: 
alpar@587: template<class MIP>
alpar@587: void cloneTest()
alpar@587: {
deba@598: 
alpar@587:   MIP* mip = new MIP();
alpar@587:   MIP* mipnew = mip->newSolver();
alpar@587:   MIP* mipclone = mip->cloneSolver();
alpar@587:   delete mip;
alpar@587:   delete mipnew;
alpar@587:   delete mipclone;
alpar@587: }
deba@481: 
deba@481: int main()
deba@481: {
deba@481: 
ladanyi@674: #ifdef LEMON_HAVE_GLPK
deba@482:   {
alpar@485:     GlpkMip mip1;
deba@482:     aTest(mip1);
alpar@587:     cloneTest<GlpkMip>();
deba@482:   }
deba@481: #endif
deba@481: 
ladanyi@674: #ifdef LEMON_HAVE_CPLEX
deba@482:   try {
alpar@485:     CplexMip mip2;
deba@482:     aTest(mip2);
deba@598:     cloneTest<CplexMip>();
deba@482:   } catch (CplexEnv::LicenseError& error) {
deba@482:     check(false, error.what());
deba@482:   }
deba@481: #endif
deba@481: 
ladanyi@674: #ifdef LEMON_HAVE_CBC
deba@614:   {
deba@614:     CbcMip mip1;
deba@614:     aTest(mip1);
deba@614:     cloneTest<CbcMip>();
deba@614:   }
deba@614: #endif
deba@614: 
deba@481:   return 0;
deba@481: 
deba@481: }