mirror of https://github.com/CGAL/cgal
100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
// Copyright (c) 1997-2001 ETH Zurich (Switzerland).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org).
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// You can redistribute it and/or modify it under the terms of the GNU
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// General Public License as published by the Free Software Foundation,
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// either version 3 of the License, or (at your option) any later version.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Kaspar Fischer <fischerk@inf.ethz.ch>
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#include <iostream>
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#include <sstream>
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#include <cstdlib>
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#include <CGAL/basic.h>
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#ifndef CGAL_USE_GMP
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#include <CGAL/MP_Float.h>
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#else
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#include <CGAL/Gmpz.h>
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#endif
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#include <CGAL/QP_solver/QP_solver.h>
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#include <CGAL/QP_solver/QP_full_exact_pricing.h>
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#include <CGAL/QP_solver/QP_exact_bland_pricing.h>
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#include <CGAL/QP_solver/QP_partial_exact_pricing.h>
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#include <CGAL/QP_solver/QP_full_filtered_pricing.h>
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#include <CGAL/QP_solver/QP_partial_filtered_pricing.h>
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#include <CGAL/QP_models.h>
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#include <CGAL/QP_functions.h>
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#include <CGAL/QP_solution.h>
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int main(const int argNr,const char **args) {
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using std::cout;
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using std::endl;
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using CGAL::Tag_true;
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using CGAL::Tag_false;
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// get desired level of additional logging output:
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const int verbosity = argNr < 2? 1 : std::atoi(args[1]);
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// construct QP instance:
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typedef int IT;
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#ifndef CGAL_USE_GMP
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typedef CGAL::MP_Float ET;
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#else
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typedef CGAL::Gmpz ET;
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#endif
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typedef CGAL::Quadratic_program_from_mps<IT> QP;
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QP qp(std::cin);
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// check for format errors in MPS f\ile:
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if (!qp.is_valid()) {
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cout << "Input is not a valid MPS file." << endl
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<< "Error: " << qp.get_error() << endl;
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std::exit(2);
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}
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if (verbosity > 0) {
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CGAL::print_quadratic_program (cout, qp);
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cout << std::endl;
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}
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CGAL::Quadratic_program_options options;
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options.set_pricing_strategy(CGAL::QP_DANTZIG);
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options.set_verbosity(0);
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typedef CGAL::Quadratic_program_solution<ET> Solution;
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Solution s = CGAL::solve_quadratic_program (qp, ET(), options);
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// get solution:
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if (s.status() == CGAL::QP_OPTIMAL) {
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// output solution:
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cout << "Objective function value: " <<
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s.objective_value() << endl;
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cout << "Variable values:" << endl;
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Solution::Variable_value_iterator it
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= s.variable_values_begin() ;
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for (int i=0; i < qp.get_n(); it++, ++i)
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cout << " " << qp.variable_name_by_index(i) << " = "
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<< CGAL::to_double(*it) << endl;
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return 0;
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}
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if (s.status() == CGAL::QP_INFEASIBLE)
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cout << "Problem is infeasible." << endl;
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else // unbounded
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cout << "Problem is unbounded." << endl;
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return 0;
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}
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