Objective variables are defined to construct an objective function. The objective function is a summation of all variables that are designated as objective-type. Variables are defined as objective function contributions by starting with obj. Thus, the variables obj1, objective, object would be included in the objective function summation.
Additionally, slack variables are included in the objective function. These variables begin with the key letters slk and are defined with a lower bound of zero.
Minimize vs. Maximize
The objective function is always minimized with APMonitor. Objective function maximization is accomplished by defining a new variable that is the negative of the minimized objective.
! Example model with an objective function Model example Parameters p1 = 5 End Parameters Variables objective v1 > 6 End Variables Equations objective = (v1 - p1)^2 End Equations End Model
Solution p1 = 5 v1 = 6 objective = 1