[SOLVED] Anylogic is assigning the value to all entities instead of only one

Anylogic is assigning the value to all entities instead of only one

My source has the following code in "On at exit" field: TRUCK.ID_number = parameter; parameter = parameter + 1;

Then, each truck will receive an ID: 1, 2, 3, ...

The problem is that All the trucks are circulating at the same time and it looks like everytime a new truck is generated and the code runs it resets the ID for all trucks.

For example: When truck 4 (ID = 4) is created at the source all the other trucks receive ID 4 so I cannot know the correct ID of each truck.

What am I doing wrong?

Solution

a few things. First, you need to use the keyword agent in the onExit code box. So in your case, agent.ID_number=parameter. Please read up on these specific keywords that pop up everywhere in AnyLogic code boxes. I call it the "magic lightbulb", also see my blog on that topic:

The magic lightbulb

Second, newly created agents automatically get a unique index (if they belong to the same population). You can access that using the getIndex() method inside your truck agent.