Lottery Example
Model was written in NetLogo 5.0.4
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to setup clear-all ;; create a turtle on every fifth patch ask patches with [pxcor mod 5 = 0 and pycor mod 5 = 0] [ sprout 1 [ ;; vary the size of the turtles set size 2 + random 6 ;; start them out with no wins set label 0 ;; make turtles darker so the labels stand out set color color - 2 ] ] reset-ticks end to go ask lottery-winner [ set label label + 1 ] tick end ;; The idea behind this procedure is a bit tricky to understand. ;; Basically we take the sum of the sizes of the turtles, and ;; that's how many "tickets" we have in our lottery. Then we pick ;; a random "ticket" (a random number). Then we step through the ;; turtles to figure out which turtle holds that ticket. to-report lottery-winner let pick random-float sum [size] of turtles let winner nobody ask turtles [ ;; if there's no winner yet... if winner = nobody [ ifelse size > pick [ set winner self ] [ set pick pick - size ] ] ] report winner end ; Public Domain: ; To the extent possible under law, Uri Wilensky has waived all ; copyright and related or neighboring rights to this model.
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Attached files
File | Type | Description | Last updated | |
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Lottery Example.png | preview | Preview for 'Lottery Example' | over 11 years ago, by Uri Wilensky | Download |
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