C++ (Cpp) getObjCoefs Exemples

Exemple #1

Fichier : iloadmipex2.cpp Projet : andreasmattas/testcode

ILOHEURISTICCALLBACK1(Rounddown, IloNumVarArray, vars) {
   IntegerFeasibilityArray feas;
   IloNumArray             obj;
   IloNumArray             x;
   try {
      feas = IntegerFeasibilityArray(getEnv());
      obj  = IloNumArray(getEnv());
      x    = IloNumArray(getEnv());
      getFeasibilities(feas, vars);
      getObjCoefs     (obj , vars);
      getValues       (x   , vars);

      IloNum objval = getObjValue();
      IloInt cols   = vars.getSize();
      for (IloInt j = 0; j < cols; j++) {
         // Set the fractional variable to zero and update the objective value
         if ( feas[j] == Infeasible ) {
            objval -= x[j] * obj[j];
            x[j] = 0.0;
         }
      }
      setSolution(vars, x, objval);
   }
   catch (...) {
      feas.end();
      obj.end();
      x.end();
      throw;
   }
   feas.end();
   obj.end();
   x.end();
}

Exemple #2

Fichier : cplexMip.cpp Projet : FernandoDucha/hcimp

ILOBRANCHCALLBACK1(MyBranch, IloNumVarArray, vars) {
   if ( getBranchType() != BranchOnVariable )
      return;

   // Branch on var with largest objective coefficient
   // among those with largest infeasibility

   IloNumArray x;
   IloNumArray obj;
   IntegerFeasibilityArray feas;

   try {
      x    = IloNumArray(getEnv());
      obj  = IloNumArray(getEnv());
      feas = IntegerFeasibilityArray(getEnv());
      getValues(x, vars);
      getObjCoefs(obj, vars);
      getFeasibilities(feas, vars);

      IloInt bestj  = -1;
      IloNum maxinf = 0.0;
      IloNum maxobj = 0.0;
      IloInt cols = vars.getSize();
      for (IloInt j = 0; j < cols; j++) {
         if ( feas[j] == Infeasible ) {
            IloNum xj_inf = x[j] - IloFloor (x[j]);
            if ( xj_inf > 0.5 )
               xj_inf = 1.0 - xj_inf;
            if ( xj_inf >= maxinf                              &&
                 (xj_inf > maxinf || IloAbs (obj[j]) >= maxobj)  ) {
               bestj  = j;
               maxinf = xj_inf;
               maxobj = IloAbs (obj[j]);
            }
         }
      }

      if ( bestj >= 0 ) {
         makeBranch(vars[bestj], x[bestj], IloCplex::BranchUp,   getObjValue());
         makeBranch(vars[bestj], x[bestj], IloCplex::BranchDown, getObjValue());
      }
   }
   catch (...) {
      x.end();
      obj.end();
      feas.end();
      throw;
   }
   x.end();
   obj.end();
   feas.end();
}

Exemple #3

Fichier : ilogoalex1.cpp Projet : mamadzebal/server-load-balancing-in-sdn

ILOCPLEXGOAL1(MyBranchGoal, IloNumVarArray, vars) {
   IloNumArray x;
   IloNumArray obj;
   IntegerFeasibilityArray feas;

   x    = IloNumArray(getEnv());
   obj  = IloNumArray(getEnv());
   feas = IntegerFeasibilityArray(getEnv());
   getValues(x, vars);
   getObjCoefs(obj, vars);
   getFeasibilities(feas, vars);

   IloInt bestj  = -1;
   IloNum maxinf = 0.0;
   IloNum maxobj = 0.0;
   IloInt cols = vars.getSize();
   for (IloInt j = 0; j < cols; j++) {
      if ( feas[j] == Infeasible ) {
         IloNum xj_inf = x[j] - IloFloor (x[j]);
         if ( xj_inf > 0.5 )
            xj_inf = 1.0 - xj_inf;
         if ( xj_inf >= maxinf                             &&
             (xj_inf > maxinf || IloAbs (obj[j]) >= maxobj)  ) {
            bestj  = j;
            maxinf = xj_inf;
            maxobj = IloAbs (obj[j]);
         }
      }
   }

   IloCplex::Goal res;
   if ( bestj >= 0 ) {
      res = AndGoal(OrGoal(vars[bestj] >= IloFloor(x[bestj])+1,
                           vars[bestj] <= IloFloor(x[bestj])),
                    this);
   }

   x.end();
   obj.end();
   feas.end();

   return res;
}