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NetLogo 3.0.2 User Manual Table of Contents FAQ (Frequently Asked Questions) How do I cite a model from the Models Library in an academic publication?................151 What license is NetLogo released under? Are there are any legal restrictions on use, redistribution, etc.?..........................................................................................151 Is the source code to NetLogo available?......................................................................152 Do you offer any workshops or other training opportunities for NetLogo?.....................152 What's the difference between StarLogo, MacStarLogo, StarLogoT, and NetLogo?....152 Has anyone built a model of ?..................................................................................152 Are NetLogo models runs scientifically reproducible?...................................................152 Are there any NetLogo textbooks?.................................................................................153 Is NetLogo available in a Spanish version, German version, (your language here) version, etc.?...........................................................................................................153 Is NetLogo compiled or interpreted?..............................................................................153 Will NetLogo and NetLogo 3D remain separate?...........................................................154 Downloading........................................................................................................................154 The download form doesn't work for me. Can I have a direct link to the software?.......154 Downloading NetLogo takes too long. Is it available any other way, such as on a CD?.........................................................................................................................154 I downloaded and installed NetLogo but the Models Library has few or no models in it. How can I fix this?...........................................................................................154 Can I have multiple versions of NetLogo installed at the same time?............................154 I'm on a UNIX system and I can't untar the download. Why?........................................154 How do I install NetLogo on Windows 2003 or Windows Server 2003?........................155 Applets.................................................................................................................................155 I tried to run one of the applets on your site, but it didn't work. What should I do?........155 Can I make my model available as an applet while keeping the code secret?..............155 Can a model saved as an applet use import−world, file−open, and other commands that read files?.........................................................................................................156 Usage...................................................................................................................................156 Can I run NetLogo from a CD?......................................................................................156 How do I change how many patches there are?............................................................156 Can I use the mouse to "paint" in the view?...................................................................156 How big can my model be? How many turtles, patches, procedures, buttons, and so on can my model contain?.................................................................................156 Can I import an image into NetLogo?............................................................................157 Can I import GIS data into NetLogo?.............................................................................157 My model runs slowly. How can I speed it up?..............................................................157 I want to try HubNet. Can I?...........................................................................................158 Can I run a NetLogo model from the command line? Can I run it without a GUI?.........158 Can I have more than one model open at a time?.........................................................159 Can I save the contents of the view? Of the interface tab?............................................159 Can I make a movie of my model?.................................................................................159 Does NetLogo take advantage of multiple processors?.................................................159 Can I distribute NetLogo model runs across a cluster of computers?............................159 Can I use screen−edge−x or screen−edge−y, etc., as the minimum or maximum of a slider?...................................................................................................................160 Can I change the choices in a chooser on the fly?........................................................160 Can I divide the code for my model up into several files?..............................................160 vi
NetLogo 3.0.2 User Manual Table of Contents FAQ (Frequently Asked Questions) Programming.......................................................................................................................160 How is the NetLogo language different from the StarLogoT language? How do I convert my StarLogoT model to NetLogo?.............................................................160 How does the NetLogo language differ from other Logos?............................................160 The NetLogo world is a torus, that is, the edges of the screen are connected to each other, so turtles and patches "wrap around". Can I use a different world topology: bounded, infinite plane, sphere, etc.?......................................................162 How do I take the negative of a number?......................................................................162 My turtle moved forward 1, but it's still on the same patch. Why?.................................162 patch−ahead 1 is reporting the same patch my turtle is already standing on. Why?.....162 How do I give my turtles "vision"?..................................................................................163 Can agents sense what's in the drawing layer?.............................................................163 Does NetLogo have a command like StarLogo's "grab" command?.............................163 I tried to put −at after the name of a variable, for example variable−at −1 0, but NetLogo won't let me. Why not?.............................................................................163 I'm getting numbers like 0.10000000004 and 0.799999999999 instead of 0.1 and 0.8. Why?................................................................................................................164 How can I keep two turtles from occupying the same patch?........................................164 How can I find out if a turtle is dead?.............................................................................164 How do I find out how much time has passed in my model?.........................................164 Does NetLogo have arrays?..........................................................................................164 Does NetLogo have associative arrays or lookup tables?.............................................165 How can I use different patch "neighborhoods" (circular, Von Neumann, Moore, etc.)?.......................................................................................................................165 Can I connect turtles with lines, to indicate connections between them?......................165 How can I convert an agentset to a list, or vice versa?..................................................165 What if I want to "ask" an agentset in random order?....................................................165 How does NetLogo decide when to switch from agent to agent when running code?...166 Primitives Dictionary.....................................................................................................................167 Categories of Primitives.......................................................................................................167 Turtle−related.................................................................................................................167 Patch−related primitives.................................................................................................167 Agentset primitives.........................................................................................................167 Color primitives..............................................................................................................168 Control flow and logic primitives.....................................................................................168 World primitives..............................................................................................................168 Perspective primitives....................................................................................................168 HubNet primitives...........................................................................................................168 Input/output primitives....................................................................................................168 File primitives.................................................................................................................168 List primitives.................................................................................................................168 String primitives..............................................................................................................169 Mathematical primitives..................................................................................................169 Plotting primitives...........................................................................................................169 Movie primitives.............................................................................................................169 System primitives...........................................................................................................169 vii
Page 1: NetLogo 3.0.2 User Manual
Page 4 and 5: NetLogo 3.0.2 User Manual Table of
Page 18 and 19: NetLogo 3.0.2 User Manual ♦ "Cont
Page 20 and 21: NetLogo 3.0.2 User Manual PROCUREME
Page 22 and 23: NetLogo 3.0.2 User Manual For graph
Page 24 and 25: NetLogo 3.0.2 User Manual ♦ new c
Page 26 and 27: NetLogo 3.0.2 User Manual ♦ fixed
Page 28 and 29: Version 1.3 (June 2003) • graphic
Page 30 and 31: System Requirements: Saved Applets
Page 32 and 33: NetLogo 3.0.2 User Manual 16 System
Page 34 and 35: • On Mac OS X 10.2 only, opening
Page 36 and 37: NetLogo 3.0.2 User Manual 20 Contac
Page 38 and 39: 5. Press the "open" button. 6. Wait
Page 40 and 41: tolerance level, more mixed groups
Page 42 and 43: • Press the "setup" button. What
Page 44 and 45: Another type of setting is called a
Page 46 and 47: Let's experiment with the effect of
Page 48 and 49: NetLogo 3.0.2 User Manual In Wolf S
Page 50 and 51: Sample Models The Sample Models sec
Page 52 and 53: In Traffic Basic: • Press the "se
Page 54 and 55: • Choose "Turtles" from the popup
Page 56 and 57: To get a color that doesn't have it
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other way is to type inspect turtle
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NetLogo 3.0.2 User Manual 44 Tutori
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Now you have a button called 'setup
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Then add its procedure to the Proce
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The setup−patches procedure sets
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that. Write: to setup−patches ask
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Another common tool to see what's g
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in the code. Even one extra space w
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What's Next? So now you have a nice
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NetLogo 3.0.2 User Manual 60 Tutori
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Edit Tools Export Interface Save a
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The buttons in the toolbar are desc
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NetLogo 3.0.2 User Manual • The o
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Some shapes have true 3D counterpar
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NetLogo 3.0.2 User Manual To determ
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We recommend reading the Informatio
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NetLogo 3.0.2 User Manual 74 Interf
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The total number of patches is dete
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If a variable is a global variable,
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NetLogo 3.0.2 User Manual You can a
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Usually, the observer uses ask to a
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Code Example: Ask Agentset Example
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Example #3: The user has two foreve
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The Primitives Dictionary has a sec
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foreach [1 2 3] [ ask turtles [ fd
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When entering a number, the letter
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Plotting NetLogo's plotting feature
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with the set−plot−pen−interva
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Output This section is about output
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The user−choose−directory, user
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NetLogo 3.0.2 User Manual 102 Progr
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Shapes library And here are the sha
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Other buttons The "Rotate Left" and
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Historical Note Old versions of Net
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Go commands: These commands will be
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The −−experiment argument is us
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encoding than us−ascii, such as U
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Computer HubNet Activities The foll
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particular, networks that use the I
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NetLogo 3.0.2 User Manual 120 HubNe
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If you are using Computer HubNet, y
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When using Calculator HubNet the hu
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CC−WINDOW 323 339 638 459 Command
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NetLogo 3.0.2 User Manual 128 HubNe
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Just use the URL where you have sto
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as getIntegerValue(). • Throw org
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NetLogo 3.0.2 User Manual The exten
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} } } catch( java.io.IOException ex
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The two forms of runExperiment that
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succesfully use them, or run into p
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output−port−coast output−port
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set−output−port−power set−o
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play−drum play−drum drum veloci
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NetLogo 3.0.2 User Manual 17. Drawb
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• Can I use the mouse to "paint"
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Is the source code to NetLogo avail
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Will NetLogo and NetLogo 3D remain
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Can a model saved as an applet use
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• Use the freeze switch in the vi
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un across multiple computers, but y
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The NetLogo world is a torus, that
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I'm getting numbers like 0.10000000
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[ ask ? [ ... ] ] NetLogo 3.0.2 Use
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Color primitives color extract−hs
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Constants Mathematical Constants e
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If you are not sure how NetLogo wil
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eep beep Emits a beep. Note that th
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The error−message reporter can be
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color This is a built−in turtle v
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date−and−time date−and−time
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Unlike "distance−nowrap", turtles
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empty? empty? list empty? string Re
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values" (.csv) format. CSV files ca
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file−close−all file−close−a
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file−read−characters file−rea
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first first list first string On a
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Most often, globals is used to defi
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histogram−from turtles [color] ;;
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hubnet−message−source hubnet−
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Future versions of HubNet will supp
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import−world import−world filen
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is−string? is−turtle? is−turt
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left lt left number The turtle turn
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M map map [reporter] list (map [rep
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min−one−of min−one−of agent
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movie−grab−view movie−grab−
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neighbors neighbors4 Reports an age
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Note that nsum/nsum4 are equivalent
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See also patch−at. patch−ahead
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patches−own patches−own [var1 v
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plot−name plot−name Reports the
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pxcor pycor pxcor pycor These are b
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;; mean of 3.4 random−int−or−
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=> 8 show length read−from−stri
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emove−item remove−item index li
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ide ride turtle Set the perspective
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screen−edge−x screen−edge−y
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set−current−directory string Se
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• 2 (point mode): the plot pen dr
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=> [5 2 4 1 3] show shuffle [1 2 3
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startup startup User−defined proc
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that high in practice may vary from
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=> 40 If the name of a breed is sub
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The calling agent is not printed be
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show user−input "What is your nam
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while [reporter] [ commands ] If re
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show word "tur" "tle" => "turtle" w
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NetLogo 3.0.2 User Manual 256 Primi
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