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Lorena
Lorena

Reputation: 29

What is wrong with the way I am using "turtles-on"?

I want to model agents moving around, and dying if they reach a patch that already has a # of agents above the carrying capacity (which is determined by a slider). I tried writting it like this:

to check-if-dead
 if habitat = "escarabajo" [
  ask escarabajos [
    if pcolor = one-of [yellow lime orange grey blue ] [die]
      if escarabajos-on patch-here >= capacidad-de-carga-bosques [die] 
    ] 
  ]

but I get a message highlighting "escarabajos-on patch-here",and saying > >= expected this input to be an agent or number or string, but got a turtle agentset instead >

Upvotes: 0

Views: 35

Answers (1)

Nicolas Payette
Nicolas Payette

Reputation: 14972

The result of escarabajos-on patch-here is an agentset: the set of all escarabajos on the current patch. What you want is the number of escarabajos on the current patch, so you need to count them:

if count escarabajos-on patch-here >= capacidad-de-carga-bosques

That being said, escarabajos-on patch-here is needlessly verbose, since NetLogo also has a <breeds>-here primitive:

if count escarabajos-here >= capacidad-de-carga-bosques

Finally, I have a hunch that you meant:

if member? pcolor [ yellow lime orange grey blue ]

instead of:

if pcolor = one-of [yellow lime orange grey blue ]

The one-of primitive picks an element from a list at random, so your condition would have been true only if the randomly picked color happened to be the color of the current patch. By using member? instead, the condition will be true if the color of the patch is any member of the list.

Upvotes: 1

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