ILOG OPL Development Studio Language Reference Manual

Modeling constraintsConstraints passed to the algorithm, and which as such define the optimization problem,usually apply to decision variables; that is, they are Boolean expressions of some decisionvariables. To be taken into account by the solving algorithm, constraints must be stated usingthe optimization instruction:constraintsorsubject toas in Stating constraints by means of an optimization instruction.Stating constraints by means of an optimization instructionminimizesum(p in Products) (insideCost[p]*inside[p] + outsideCost[p]*outside[p]);subject to {forall(r in Resources)sum(p in Products) consumption[p,r] * inside[p] = demand[p];}Note:1.Optimization instructions require an objective function of type integer or float.2. That objective function must be defined before the constraints. Otherwise, a warningmessage is displayed.108I L O G O P L D E V E L O P M E N T S T U D I O L A N G U A G ER E F E R E N C E M A N U A L