MIHS-20_Period4_NickN_LeanderS_MillaL_CaitlinR
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breed [sheep a-sheep] breed [cows cow] turtles-own [ energy ] ;; agents own energy patches-own [ grass-amount ] ;; patches have grass ;; this procedures sets up the model to setup clear-all ask patches [ ;; give grass to the patches, color it shades of green set grass-amount random-float 10.0 recolor-grass ;; change the world green ] create-sheep number-of-sheep [ setxy random-xcor random-ycor set color white set shape "sheep" set energy 100 ] create-cows number-of-cows [ setxy random-xcor random-ycor set color brown set shape "cow" set energy 100 ] reset-ticks end ;; make the model run to go if not any? turtles [ stop ] ask turtles [ wiggle ;; first turn a little bit move ;; then step forward check-if-dead ;; check to see if agent should die eat ;; sheep eat grass reproduce ;; the sheep reproduce ] regrow-grass ;; the grass grows back tick my-update-plots ;; plot the population counts end ;; check to see if this sheep has enough energy to reproduce to reproduce if energy > 200 [ set energy energy - 100 ;; reproduction transfers energy hatch 1 [ set energy 100 ] ;; to the new agent ] end ;; recolor the grass to indicate how much has been eaten to recolor-grass set pcolor scale-color green grass-amount 0 20 end ;; regrow the grass to regrow-grass ask patches [ set grass-amount grass-amount + grass-regrowth-rate if grass-amount > 10.0 [ set grass-amount 10.0 ] recolor-grass ] end ;; sheep procedure, sheep eat grass to eat ;; check to make sure there is grass here if ( grass-amount >= energy-gain-from-grass ) [ ;; increment the sheep's energy set energy energy + energy-gain-from-grass ;; decrement the grass set grass-amount grass-amount - energy-gain-from-grass recolor-grass ] end ;; asks those sheep with no energy to die to check-if-dead if energy < 0 [ die ] end ;; update the plots in the interface tab to my-update-plots plot count sheep plot count cows end ;; sheep procedure, the sheep changes its heading to wiggle ;; turn right then left, so the average is straight ahead rt random 90 lt random 90 end ;; sheep procedure, the sheep moves which costs it energy to move forward 1 set energy energy - movement-cost ;; reduce the energy by the cost of movement end ; Copyright 2007 Uri Wilensky. ; See Info tab for full copyright and license.
There is only one version of this model, created over 3 years ago by Nicholas Novack.
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