I implement a discrete event simulation model namely "EOQ" in AnyLogic from https://www.runthemodel.com/models/2662/

I am going to optimize the parameters by minimizing total inventory cost. Therefore, I have to construct a function (one of the agent component in AnyLogic) in order to be able to root the total cost.

Currently, I have constructed a function and root the total cost (i.e. root.inventorycost()), but the total cost results in the same value whenever the parameters change.

is it possible to root the total cost when the model only has events, parameters, and variables? how to do it?

Thank you