QP_solver/first_nonnegative_qp_from_mps.cpp

// example: read nonnegative quadratic program in MPS format from file
// the QP below is the first nonnegative quadratic program example
// in the user manual
#include <iostream>
#include <fstream>
 
#include <CGAL/QP_models.h>
#include <CGAL/QP_functions.h>
 
// choose exact integral type
#ifdef CGAL_USE_GMP
#include <CGAL/Gmpz.h>
typedef CGAL::Gmpz ET;
#else
#include <CGAL/MP_Float.h>
typedef CGAL::MP_Float ET;
#endif
 
// program and solution types
typedef CGAL::Quadratic_program_from_mps<int> Program;
typedef CGAL::Quadratic_program_solution<ET> Solution;
 
int main() {
  std::ifstream in ("first_nonnegative_qp.mps");
  Program qp(in);         // read program from file
  assert (qp.is_valid()); // we should have a valid mps file,...
  assert (qp.is_nonnegative()); // ...and it should be nonnegative
 
  // solve the program, using ET as the exact type
  Solution s = CGAL::solve_nonnegative_quadratic_program(qp, ET());
 
  // output solution
  std::cout << s;
  return 0;
}