nxn-imitate-if-better.nlogo

globals [
  payoff-matrix
  n-of-strategies
]

breed [players player]

players-own [
  strategy
  strategy-after-revision
  payoff
]

to setup
  clear-all
  setup-payoffs
  setup-players
  setup-graph
  reset-ticks
  update-graph
end

to setup-payoffs
  set payoff-matrix read-from-string payoffs
  set n-of-strategies length payoff-matrix
end

to setup-players
 create-players n-of-players [
   set payoff 0
   set strategy (random n-of-strategies)
   set strategy-after-revision strategy
 ]
end

to setup-graph
  set-current-plot "Strategy Distribution"
  foreach (range n-of-strategies) [ i ->
    create-temporary-plot-pen (word i)
    set-plot-pen-mode 1
    set-plot-pen-color 25 + 40 * i
  ]
end

to go
  ask players [update-payoff]
  ask players [
    if (random-float 1 < prob-revision) [
      update-strategy-after-revision
    ]
  ]
  ask players [update-strategy]
  tick
  update-graph
end

to update-payoff
  let mate one-of other players
  set payoff item ([strategy] of mate) (item strategy payoff-matrix)
end

to update-strategy-after-revision
  let observed-player one-of other players

  if ([payoff] of observed-player) > payoff [
    set strategy-after-revision ([strategy] of observed-player)
  ]
end

to update-strategy
  set strategy strategy-after-revision
end

to update-graph
  let strategy-numbers (range n-of-strategies)
  let strategy-frequencies map [ n ->
        count players with [strategy = n] / n-of-players
      ] strategy-numbers

  set-current-plot "Strategy Distribution"
  let bar 1
  foreach strategy-numbers [ n ->
    set-current-plot-pen (word n)
    plotxy ticks bar
    set bar (bar - (item n strategy-frequencies))
  ]
  set-plot-y-range 0 1
end
@#$#@#$#@
GRAPHICS-WINDOW
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ticks
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INPUTBOX
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payoffs
[[ 0 -1  1]\n [ 1  0 -1]\n [-1  1  0]]
1
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String (reporter)

SLIDER
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HORIZONTAL

SLIDER
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prob-revision
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PLOT
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Strategy Distribution
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true
true
"" ""
PENS

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setup
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T
OBSERVER
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BUTTON
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go
T
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OBSERVER
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0

BUTTON
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go once
go
NIL
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T
OBSERVER
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@#$#@#$#@
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x
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NetLogo 6.2.2
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@#$#@#$#@
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0
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