

When grass is not included, watch as the sheep and wolf populations fluctuate.
NETLOGO ROUND PATCH
SHEEP-GAIN-FROM-FOOD: The amount of energy sheep get for every grass patch eaten INITIAL-NUMBER-WOLVES: The initial size of wolf population INITIAL-NUMBER-SHEEP: The initial size of sheep population Look at the POPULATIONS plot to watch the populations fluctuate over time.Look at the monitors to see the current population sizes.Press the GO button to begin the simulation.Adjust the slider parameters (see below), or use the default settings.Set the GRASS? switch to TRUE to include grass in the model, or to FALSE to only include wolves (red) and sheep (white).The construction of this model is described in two papers by Wilensky & Reisman referenced below. This variation is more complex than the first, but it is generally stable. Once grass is eaten it will only regrow after a fixed amount of time. The behavior of the wolves is identical to the first variation, however this time the sheep must eat grass in order to maintain their energy - when they run out of energy they die. The second variation includes grass (green) in addition to wolves and sheep. This variation produces interesting population dynamics, but is ultimately unstable. To allow the population to continue, each wolf or sheep has a fixed probability of reproducing at each time step. Each step costs the wolves energy, and they must eat sheep in order to replenish their energy - when they run out of energy they die. In the first variation, wolves and sheep wander randomly around the landscape, while the wolves look for sheep to prey on. There are two main variations to this model. In contrast, a system is stable if it tends to maintain itself over time, despite fluctuations in population sizes. Such a system is called unstable if it tends to result in extinction for one or more species involved. This model explores the stability of predator-prey ecosystems. Do you have questions or comments about this model? To unsubscribe from this group and stop receiving emails from it, send an email to view this discussion on the web visit. You received this message because you are subscribed to the Google Groups "netlogo-users" group.
NETLOGO ROUND HOW TO
Had this been java I could've done something likeīut unfortunately I do not know how to do the same in NetLogo, all I've been able to do so far is just ask the two breeds by giving every turtle a boolean variable called movable and setting them to true and the rest to false, is there anyway I can check the two coordinates of two different turtles on Netlogo? This is all I 've been able to do so far.

The final part of my design involves me recording down anytime a car breed drives into or in netlogo terms, is on the same patch or X and Y coordinate as the people breed as they navigate across the edge of the screen.
