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• Press the "setup" button. What do you see appear in the view? • Press the "go" button to start the simulation. As the model is running, what is happening to the wolf and sheep populations? • Press the "go" button to stop the model. Controlling the Model: Buttons When a button is pressed, the model responds with an action. A button can be a "once" button, or a "forever" button. You can tell the difference between these two types of buttons by a symbol on the face of the button. Forever buttons have two arrows in the bottom right corners, like this: Once buttons don't have the arrows, like this: NetLogo 3.0.2 User Manual Once buttons do one action and then stop. When the action is finished, the button pops back up. Forever buttons do an action over and over again. When you want the action to stop, press the button again. It will finish the current action, then pop back up. Most models, including Wolf Sheep Predation, have a once button called "setup" and a forever button called "go". Many models also have a once button called "go once" or "step once" which is like "go" except that it advances the model by one time step instead of over and over. Using a once button like this lets you watch the progress of the model more closely. Stopping a forever button is the normal way to stop a model. It's safe to pause a model by stopping a forever button, then make it go on by pressing the button again. You can also stop a model with the "Halt" item on the Tools menu, but you should only do this if the model is stuck for some reason. Using "Halt" may interrupt the model in the middle of an action, and as the result the model could get confused. • If you like, experiment with the "setup" and "go" buttons in the Wolf Sheep Predation model. Do you ever get different results if you run the model several times with the same settings? 26 Tutorial #1: Models
Adjusting Settings: Sliders and Switches The settings within a model give you an opportunity to work out different scenarios or hypotheses. Altering the settings and then running the model to see how it reacts to those changes can give you a deeper understanding of the phenomena being modeled. Switches and sliders give you access to a model's settings. Here are the switches and sliders in Wolf Sheep Predation: Let's experiment with their effect on the behavior of the model. • Open Wolf Sheep Predation if it's not open already. • Press "setup" and "go" and let the model run for about a 100 time−ticks. (Note: there is a readout of the number of ticks right above the plot.) • Stop the model by pressing the "go" button. What happened to the sheep over time? NetLogo 3.0.2 User Manual Let's take a look and see what would happen to the sheep if we change one of the settings. • Turn the "grass?" switch on. • Press "setup" and "go" and let the model run for a similar amount of time as before. What did this switch do to the model? Was the outcome the same as your previous run? Just like buttons, switches have information attached to them. Their information is set up in an on/off format. Switches turn on/off a separate set of directions. These directions are usually not necessary for the model to run, but might add another dimension to the model. Turning the "grass?" switch on affected the outcome of the model. Prior to this run, the growth of the grass stayed constant. This is not a realistic look at the predator−prey relationship; so by setting and turning on a grass growth rate, we were able to model all three factors: sheep, wolf and grass populations. Tutorial #1: Models 27
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Page 56 and 57: To get a color that doesn't have it
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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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