adding levy-flight implementation

2013-07-15 17:01:58 +02:00 · 2013-07-15 17:01:58 +02:00 · 2e444d4496
commit 2e444d4496
parent 527853ff66
1 changed files with 493 additions and 0 deletions
--- a/Source/levy-fight.nlogo
+++ b/Source/levy-fight.nlogo
@ -0,0 +1,493 @@
+turtles-own [t_FlightLength
+             t_speed
+             t_mu]
+
+
+to setup
+  __clear-all-and-reset-ticks
+  create-turtles 1
+  [
+    setxy random-xcor random-ycor
+    set t_FlightLength 0
+    set t_mu 2
+    set t_speed 1
+    set size 5
+    ;pd
+    ;set color red
+  ]
+end
+
+to go
+  ask turtles
+  [
+    move-levy
+  ]
+  tick
+end
+
+to move-levy 
+  ;incrementally move the distance of t_FlightLength
+  ;Turtles-procedure
+  if (t_FlightLength <= 0) ;a new flight must be chosen
+  [
+    rt random 360
+    set t_FlightLength Levy t_mu
+  ]
+ 
+  ifelse(t_FlightLength < t_speed) ;only necesary if you expect
+;t_FlightLength to become smaller than t_speed (not if you use integers
+;foreach t_FLightLength and speed as 1
+  [
+    fd t_FlightLength
+    set t_FlightLength 0
+  ]
+  [
+    fd t_speed
+    set t_FlightLength t_FlightLength - t_speed
+  ]
+
+end
+
+to-report Levy[I_mu] ;following Viswanathan et al. Nature 1999
+  ifelse(I_mu <= 1)
+  [
+    report random-float 100000000000 ;in the limit of mu to 1, the levy
+;distribution approaches an infinite uniform disitrubition
+  ]
+  [
+    ifelse(I_mu >= 3)
+    [
+      report abs (random-normal 0 1) ;in the limit of mu to 3, the levy
+;distribution approaches a normal distribution
+    ]
+    [
+      let a random-float 1
+      report exp(ln(a) * (1 / (1 - I_mu)))
+    ]
+  ]
+end 
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+(a general understanding of what the model is trying to show or explain)
+
+## HOW IT WORKS
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+(what rules the agents use to create the overall behavior of the model)
+
+## HOW TO USE IT
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+(how to use the model, including a description of each of the items in the Interface tab)
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+## THINGS TO NOTICE
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+(suggested things for the user to notice while running the model)
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+## THINGS TO TRY
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+(suggested things for the user to try to do (move sliders, switches, etc.) with the model)
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+## EXTENDING THE MODEL
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+## NETLOGO FEATURES
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+## RELATED MODELS
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+## CREDITS AND REFERENCES
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