NetLogo

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NetLogo

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Title: NetLogo

1
NetLogo

Uri Wilensky
Tutorial by Bin-Tzong Chie
AI-Econ Research Center, National Chengchi
University
Department of Industrial Economics, Tamkang
University

2
Outline

Introduction
Build a Model
Applets
HubNet

3
NetLogo

NetLogo is a programmable modeling environment
for simulating natural and social phenomena. It
was authored by Uri Wilensky in 1999 and is in
continuous development at the Center for
Connected Learning and Computer-Based Modeling.
More Information
http//ccl.northwestern.edu/netlogo/docs/

4
Download and Install

http//ccl.northwestern.edu/netlogo/

5
Initial the NetLogo
6
Exemplify a Model
7
Example of El Farol Problem
8
Three Main Tabs of a Model

Interface Tab
Information Tab
Procedure Tab

9
Interface Tab
World
The Interface
10
The World Setting
11
Information Tab
12
Procedure Tab
13
Initial the Model
14
Run the Model
15
How does the Model work?

Global Variables
Agents Variables
Defined Procedures
Linked with Interface
Sub procedure
Without return values
With return values

16
Global Variables

globals
attendance the current attendance at
the bar
history list of past values of
attendance
home-patches agentset of green patches
bar-patches agentset of blue patches
crowded-patch patch where we show the
"CROWDED" label

17
Agents Variables

turtles-own
strategies list of strategies
best-strategy index of the current best
strategy
attend? true if the agent currently
plans to attend the bar
prediction current prediction of the
bar attendance

18
Procedures Linked with Interface

to setup
...
...
end
to go
...
...
end

Event Trigger
19
Procedures as Sub-Procedureswithout return values

to move-to-empty-one-of
...
end
to update-plots
...
end
to update-strategies
...
end

20
Procedures as Sub-Procedures with return values

to-report predict-attendance
...
report ...
end
to-report random-strategy
...
report ...
end

21
Lets Play
22
Instance Interactive with the agents
23
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24
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25
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26
Stalk an Agent
27
Save as Applet
28
HubNet
29
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30
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31
How to apply HubNet

to startup
setup
hubnet-set-client-interface "COMPUTER"
hubnet-reset
end
to go
every 0.1
listen-clients
display
end

32
to listen-clients

to listen-clients
as long as there are more messages from the
clients
keep processing them.
while hubnet-message-waiting?
get the first message in the queue
hubnet-fetch-message
ifelse hubnet-enter-message? when clients
enter we get a special message
create-new-student
ifelse hubnet-exit-message? when clients
exit we get a special message
remove-student
ask students with user-id
hubnet-message-source
execute-command hubnet-message-tag
otherwise the message means that the user has
done something in the interface
hubnet-message-tag
is the name of the widget that was changed
end