Did anyone work with set_center method in AnyLogic?

Question

I'm using AnyLogic for a project in Supply Chain. I would love to ask those who have seen the predefined model in AnyLogic.

Its path is in: Welcome > Example Models > Supply Chains and Logistics > Product delivery. In the model they used a function called set_center (You can find it in the Main). You can find below the code in AnyLogic

for (Distributor distributor : distributors) 
    distributor.set_center(
        distributor.getNearestAgentByRoute(manufacturingCenters));

For my project, I created a model inspired from the predefined model described above but the function set_center didn't work. It tells me in the console

The method set_center(shiptopoint.getNearestAgentByRoute(retailers)) is undefined for the type Shiptopoint

Where shiptopoint and retailers are agents that I created for my model (They are both population agents)

I tried to find the Java Code but I didn't find it.
Does anyone have a clue please?

Answer 1

set_center(...) is an automatically created method for the parameter center in the agent type Distributor. Each parameter you create gets such a method, see AnyLogic help on parameters.

You lack a parameter center in your agent type, so there is no such method.