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NetLogo 3.0.2 User Manual In Wolf Sheep Predation, when the "grass?" switch is on the individual patches are easily seen, because some of them are green, while others are brown. Think of the patches as being like square tiles in a room with a tile floor. Exactly in the middle of the room is a tile labeled (0,0); meaning that if the room was divided in half one way and then the other way, these two dividing lines would intersect on this tile. We now have a coordinate system that will help us locate objects within the room: How many tiles away is the (0,0) tile from the right side of the room? How many tiles away is the (0,0) tile from the left side of the room? In NetLogo, the distance the middle tile is from the right or left edge of the room this is called Screen Edge X. And the distance the middle tile is from the top and bottom edges is called Screen Edge Y: 32 Tutorial #1: Models
In these diagrams, Screen Edge X is 3 and Screen Edge Y is 2. When you change the patch size, the number of patches (tiles) doesn't change, the patches only get larger or smaller on the screen. Let's look at the effect of changing Screen Edge X and Screen Edge Y. • Using the Edit dialog that is still open, change Screen Edge X to 30 and Screen Edge Y value to 10. What happened to the shape of the view? • Press the "setup" button. Now you can see the new patches you have created. • Edit the view again. • Change the patch size to 20 and press "OK". What happened to the size of the view? Did its shape change? Editing the view also lets you change other settings, including the font size of labels and whether the view uses shapes. Feel free to experiment with these and other settings as well. Once you are done exploring the Wolf Sheep Predation model, you may want to take some time just to explore some of the other models available in the Models Library. The Models Library NetLogo 3.0.2 User Manual The library contains five sections: Sample Models, Curricular Models, Code Examples, HubNet Calculator Activities, HubNet Computer Activities. Tutorial #1: Models 33
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Page 28 and 29: Version 1.3 (June 2003) • graphic
Page 30 and 31: System Requirements: Saved Applets
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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 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
Page 58 and 59: other way is to type inspect turtle
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Page 62 and 63: Now you have a button called 'setup
Page 64 and 65: Then add its procedure to the Proce
Page 66 and 67: The setup−patches procedure sets
Page 68 and 69: that. Write: to setup−patches ask
Page 70 and 71: Another common tool to see what's g
Page 72 and 73: in the code. Even one extra space w
Page 74 and 75: What's Next? So now you have a nice
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Page 78 and 79: Edit Tools Export Interface Save a
Page 80 and 81: The buttons in the toolbar are desc
Page 82 and 83: NetLogo 3.0.2 User Manual • The o
Page 84 and 85: Some shapes have true 3D counterpar
Page 86 and 87: NetLogo 3.0.2 User Manual To determ
Page 88 and 89: We recommend reading the Informatio
Page 90 and 91: NetLogo 3.0.2 User Manual 74 Interf
Page 92 and 93: The total number of patches is dete
Page 94 and 95: If a variable is a global variable,
Page 96 and 97: 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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