CODEWITHSUNDEEP
listnetlogoagent-based-modeling
user710
user710

Reputation: 161

plot an item in a list which keeps updating in Netlogo

I defined a set of attributes for some producer agents in the interface as global variables and then assigned them to a list (in the setup) which is also global and the agents will use its content.

The problem is that I cannot plot them.

Defined in the interface as global variables : p1-size = 9, p2-size = 13, p3-size = 14.5, p1-rate = 80, p2-rate = 50, p3-rate = 98

to setup

  ca  ; clear-all
  reset-ticks
  file-close-all
  setup-patches
  create-prod ; create producers
  set size-set ((list p1-size p2-size p3-size))
  set rate-set ((list p1-rate p2-rate p3-rate))

I want to plot and monitor how the rates changes, and I encounter an error by defining this :

plot item  0 size-set

Size-set is global, but the error says "ITEM expected to be a string or list but got the number 0 instead.

I'd appreciate any help regarding this.

Thanks,

Upvotes: 1

Views: 519

Answers (1)

Nicolas Payette
Nicolas Payette

Reputation: 14972

The reset-ticks primitive has the side effect of updating the plots. In your code, you're calling reset-ticks before setting the value of size-set, so at the time your plot calls plot item 0 size-set, your size-set global still has its default value of 0.

Two potential solutions:

  • Move reset-ticks to the end of your setup procedure. That way, size-set will be correctly initialized when your plot is updated. Unless you have a very particular reason to do otherwise, this is the solution you should choose. It is the standard in NetLogo to call reset-ticks only at the end of setup.

  • You shouldn't do this unless you have a good reason, but you could also have some sort of "guard condition" in your plotting statement: if is-list? size-set [ plotxy ticks item 0 size-set ]. Notice the use of plotxy instead of plot to ensure that you're still plotting at the correct x position even if your guard condition causes you to skip some ticks.

Upvotes: 4

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