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view/download model file: eco1.nlogo

WHAT IS IT?

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HOW IT WORKS

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HOW TO USE IT

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THINGS TO NOTICE

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THINGS TO TRY

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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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PROCEDURES

;++++++++++++++++++++++++++++
; initialization procedures
;++++++++++++++++++++++++++++

patches-own [penergy]
turtles-own [mobility energy]
globals [halt]             ; set halt to true to stop simulation

;++++++++++++++++++++++++++++
; main procedures
;++++++++++++++++++++++++++++

;initialize all patches and turtles
to init
  ca                         ; clear all patches & kill all turtles
  init-globals
  crt 100
  ask patches [init-patch]
  ask turtles [init-turtle]
end

; start button resumes & pauses iterations of this procedure
to update
  if halt [stop]
  tick                       ; advance clock by 1 second
  ask patches [update-patch]
  ask turtles [update-turtle]
  update-globals
end

;++++++++++++++++++++++++++++
; initialization procedures
;++++++++++++++++++++++++++++

to init-globals
  ; init globals here
  set halt false
end

to init-patch
  set penergy random 100
  set pcolor scale-color green penergy 200 0
end

to init-turtle
   set mobility 2
   set energy 100
   ;set metabolism random max-metabolism
   setxy random-xcor random-ycor
   set color scale-color red energy 200 0
   set shape "turtle"
end


;++++++++++++++++++++++++++++
; update procedures
;++++++++++++++++++++++++++++

to update-patch
   ifelse 100 - penergy < grow-back-rate
   [
     set penergy 100
   ]
   [
     set penergy penergy + grow-back-rate
   ]
   set pcolor scale-color green penergy 200 0
end

to update-turtle
   move
   let energy-available [penergy] of patch-here
   let energy-needed 100 - energy
   ifelse energy-available < energy-needed
   [
     set energy energy + energy-available
     ask patch-here [set penergy 0]
   ]
   [
     set energy 100
     ask patch-here [set penergy penergy - energy-needed]
   ]
   set color scale-color red energy 200 0
end

to update-globals
  ; change state of any globals
end

;++++++++++++++++++++++++++++
; helper procedures
;++++++++++++++++++++++++++++

to move
  rt random 360
  fd mobility
  set energy energy - metabolism
  if energy <= 0 [print "a turtle died!" die]
end

to-report avg-penergy
  report mean [penergy] of patches
end

to-report avg-energy
  report mean [energy] of turtles
end

to-report population
  report count turtles
end