CODEWITHSUNDEEP
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Roger
Roger

Reputation: 73

How to model spawning after kill/miss in Predator-Prey model in Netlogo?

I'm working on a Predator-Prey model but I have a unique spawning mechanic that I'm trying to work in.

The idea is that when a wolf encounters sheep, there is a probability of the sheep escaping (I already have this part coded in). If the sheep is killed, n number of lambs are created. If the sheep escapes, k number of lambs are created. After t periods, the lambs become prey. n, k, and t will all be sliders on the interface side.

I'm pretty new to agent-based modeling and Netlogo coding, so any advice would be really appreciated.

This is the current code for the hunting:

to catch-sheep  ;; wolf procedure
    let prey one-of sheep-here   
    if prey != nobody and random 100 < kill-probability 
        [ ask prey [ die ]

Upvotes: 1

Views: 97

Answers (2)

David Merinos
David Merinos

Reputation: 1295

Using your code to add some code and see if that works for you.

When a sheeps is killed create a random number of new sheeps, in the code below use your slide variable instead of 10.

I use the primitive function hatch to do all the work.

to catch-sheep  ;; wolf procedure
    let prey one-of sheep-here   
    if prey != nobody and random 100 < kill-probability 
        [ ask prey [ die ] 
          ;;Here we create new sheeps upon prey death
          let rd-num random 10 ;; 1 to 10 sheeps will appear
          hatch-sheep rd-num [ set color blue
                              set xcor 9 ;; Initialize your new sheeps ]
        ]

Let us know of any questions you might have! Happy coding.

Upvotes: 0

Alan
Alan

Reputation: 9620

Presumably k>n, so you can have all adult sheep hatch n lambs, and then catch-sheep, and then have all remaining adult sheep hatch k-n lambs. This requires distinguishing between lambs and adults, so you may want to add an age attribute.

However, I suspect you will want to switch to probabilities of hatching a lamb each tick, rather than a number of lambs hatched each tick.

Upvotes: 0

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