Shopping Checkout

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Tanya Flores (Author)

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Click to Run Model

globals [
  checkout-one?
  checkout-two?
  checkout-three?
  checkout-number  
  wait-time1
  wait-time2
  wait-time3
 ]
turtles-own [
  energy
]

to setup
  clear-all
  set-default-shape turtles "person"
  crt population
  [ set size 2         
    set color red  ] 
  setup-store
end 

to setup-store
 ask patch -10 6
  [set checkout-number 1 
    set checkout-one? (distancexy -10 6) < 1
    set pcolor cyan]
 ask patch 0 6
  [set checkout-number 2
    set checkout-two? (distancexy 0 6) < 1
    set pcolor blue]
 ask patch 10 6
  [set checkout-number 1 
    set checkout-three? (distancexy 10 6) < 1
    set pcolor white]
end 

to go  ;; forever button
  ask turtles
  [ if who >= ticks [ stop ] ;; delay initial departure
    if color = red
    [ look-for-checkout ] ;;ready for checkout? find checkout  
    keep-shopping
    fd 1 ]
  
  ask patches
  [if checkout-number = 1 [set wait-time1 wait-time1 * (1 - regular-checkout-rate)]
  if checkout-number = 2 [set wait-time2 wait-time2 * (1 - self-checkout-rate)]
  if checkout-number = 3 [set wait-time3 wait-time3 * (1 - item-checkout-rate)] ] 
  tick
  do-plotting
end 

to keep-shopping  ;; turtle procedure
  rt random 40
  lt random 40
  if not can-move? 1 [ rt 180 ]
end 

to look-for-checkout  ;; turtle procedure
  if patch-here = patch -10 6
    [set color orange + 1
    stamp
    set wait-time1 wait-time1 + 1        ;; and increase the wait time
    set energy ticks + wait-time1
    if ticks > energy [die]
    stop]
  if patch-here = patch 0 6
    [set color orange + 1 
    stamp
    set wait-time2 wait-time2 + 1        ;; and increase the wait time
    set energy ticks + wait-time2
    if ticks > energy [die]
    stop]
 if patch-here = patch 10 6
    [set color orange + 1         ;; find store
    stamp
    set wait-time3 wait-time3 + 1        ;; and increase the wait time
    set energy ticks + wait-time3
    if ticks > energy [die]
    stop]
 
   rt 45
end 

to do-plotting
  set-current-plot "Wait time"
  set-current-plot-pen "15-item checkout"
  plot  wait-time3
  set-current-plot-pen "self checkout"
  plot  wait-time1
   set-current-plot-pen "regular checkout"
  plot  wait-time2
end

There is only one version of this model, created almost 14 years ago by Tanya Flores.

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