Contents.1 IntroductionThis short article summarized some technical and conceptual hightlights from Wilensky et al. Wolf Sheep Grass predation models created in.NetLogo is a tool for, which is part of what can be called computational thinking. Wolf Sheep Grass ABMS. Wilensky, U. NetLogo Wolf Sheep Predation model. 2.2 The wolf - sheep - grass modelThe second models is described by Wilensky like this: “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. Once grass is eaten it will only regrow after a fixed amount of time.
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This variation is more complex than the first, but it is generally stable. It is a closer match to the classic Lotka Volterra population oscillation models. The classic LV models though assume the populations can take on real values, but in small populations these models underestimate extinctions and agent-based models such as the ones here, provide more realistic results.
(See Wilensky & Rand, 2015; hapter 4). The construction of this model is described in two papers by Wilensky & Reisman (1998; 2006) ”In the picture below you can see that this model has a 'stable' oscillation over time. After 4500 ticks, both sheep and wolves are still around. Wolf Sheep Grass ABMS. Wilensky, U. NetLogo Wolf Sheep Predation model. 2.3 Agent modelisationAgents are programmed as turtles.
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Both wolves and sheep can move around. Both sheep and wolves have energy that depletes over time. if a wolf encounters a sheep he can eat it and augment his energy. The sheep can eat grass.The following code found in the NetLogo distribution runs the simulation, we removed some peripheral stuff and expanded some comments. Since Mediawiki cannot display logo code, we use comment syntax from BASIC (i.e. Globals max - sheep ; ' don't let sheep population grow too large; ' Sheep and wolves are both breeds of turtle.
Breed sheep a - sheep ; ' sheep is its own plural, so we use 'a-sheep' as the singular. Breed wolves wolf turtles - own energy ; ' both wolves and sheep have energy patches - own countdown ; ' used to compute regrowth of grass, starts at grass-regrowth-time.; ' Setup procedure. Wilensky, U. NetLogo Wolf Sheep Predation model. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.
↑ Wilensky, U. & Reisman, K. Connected Science: Learning Biology through Constructing and Testing Computational Theories – an Embodied Modeling Approach.
International Journal of Complex Systems, M. 1 - 12. ↑ Wilensky, U.
& Reisman, K. Thinking like a Wolf, a Sheep or a Firefly: Learning Biology through Constructing and Testing Computational Theories – an Embodied Modeling Approach. Cognition & Instruction, 24(2), pp. 171-209. ↑ Wilensky, U. NetLogo Wolf Sheep Predation model. Center for Connected Learning and Computer-Based Modeling, Northwestern University, Evanston, IL.