Download e-book for iPad: Agent-Based and Individual-Based Modeling: A Practical by Steven F. Railsback, Volker Grimm

By Steven F. Railsback, Volker Grimm

ISBN-10: 0691136734

ISBN-13: 9780691136738

Agent-based modeling is a brand new strategy for figuring out how the dynamics of organic, social, and different advanced structures come up from the features and behaviors of the brokers making up those structures. This leading edge textbook provides scholars and scientists the abilities to layout, enforce, and research agent-based types. It starts off with the basics of modeling and offers an advent to NetLogo, an easy-to-use, unfastened, and robust software program platform. 9 chapters then each one introduce a major modeling notion and express the right way to enforce it utilizing NetLogo. The publication is going directly to current thoughts for locating the appropriate point of version complexity and constructing conception for agent habit, and for studying and studying from models.

Agent-Based and Individual-Based Modeling gains concise and available textual content, a number of examples, and workouts utilizing small yet clinical versions. The emphasis all through is on analysis--such as software program checking out, thought improvement, robustness research, and realizing complete models--and on layout matters like optimizing version constitution and discovering solid parameter values.

the 1st hands-on advent to agent-based modeling, from conceptual layout to machine implementation to parameterization and analysis
presents an creation to NetLogo with 9 chapters introducing a massive modeling thought and exhibiting find out how to enforce it utilizing NetLogo
full of examples and workouts, with updates and supplementary fabrics at
Designed for college kids and researchers around the organic and social sciences
Written by way of prime practitioners

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Additional resources for Agent-Based and Individual-Based Modeling: A Practical Introduction

Sample text

Understanding NetLogo’s world wrapping is extremely important! ” Save your work often! NetLogo will not recover your unsaved work if something bad happens. ) Now let’s make the number of clusters of red patches a model parameter. In our models and programs, we usually try not to write numbers that control important things directly into the deep code—which is called “hardwiring” them. Instead, we make them parameters that are easy to find and change. To do this, we need to create a global variable named num-­ clusters and give it a value of 4, then use num-­clusters in the ask statement that creates the clusters.

1 Summary Our goal in this chapter was to get you over the biggest hump in becoming a NetLogo user: learning the very basics such as what patches, turtles, links, and the observer are; how the graphical displays on the Interface tab work; what procedures, primitives, commands, and reporters are; and how programs are organized, with the setup procedure and button to initialize the model and the go procedure and button to make it run. And we hope you have started learning to program fearlessly by adding a statement or two, using the Check button, seeing what happens on the Interface, then adding some more.

First, each hunter must have its own unique value of this variable, so it must be a turtle variable. We need to define time-­since-­last-­found as a turtle variable. Just after the globals statement at the start of your program, add turtles-­own [ time-­since-­last-­found ] Second, we need to set the initial value of this variable when we create the hunters. We will set it assuming the hunters have not found a mushroom yet, by using a value larger than 20. In the setup procedure, change the create-­turtles statement to this: crt 2 [ set size 2 Getting Started with NetLogo 25 set color yellow set time-­since-­last-­found 999 ] Finally, the hunters must update time-­since-­last-­found each step.

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Agent-Based and Individual-Based Modeling: A Practical Introduction by Steven F. Railsback, Volker Grimm

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