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Ramiro Farto
Ramiro Farto

Reputation: 73

How to compare the amount of turtles at different times (ticks) in Netlogo?

I´m trying to see how many turtles are added and eliminated from the simulation each tick. I want to do something like this:

If (count turtles - count turtles in t-1) > 0

Then

[]

End

The model I´m trying to do that for is the team assembly model from the netlogo´s library.

Upvotes: 0

Views: 70

Answers (1)

Alan
Alan

Reputation: 9620

If you want to keep records, you have to do it explicitly. Often global variables are used for this. E.g.,

globals [laggedCount]
to setup
  ca
  crt 25
end
to provideExample
  set laggedCount count turtles
  ask turtles [
    if random-float 1 < 0.1 [die]
  ]
  print laggedCount - count turtles
end

In this case, since the relevant code is in a single procedure, you could use a local variable (which is preferable). But to share such information across procedures you will either need to pass it explicitly or use a global variable. Finally, note that you could assign to this global a list to which you repeatedly append, so that you could store the entire history of values during your simulation. (Finally finally, if that's what you want, you could alternatively plot those values during the simulation and export the plot afterwards.)

Upvotes: 1

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