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view/download model file: NowakMaysBase.1.4.nlogo

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HOW IT WORKS

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HOW TO USE IT

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THINGS TO TRY

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EXTENDING THE MODEL

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NETLOGO FEATURES

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CODE

globals
[
 tempScore
 bestNeighborScore
 bestNeighborStrat
]

patches-own
[
   coop?    ;; cooperate=1, defect=0
   score    ;; total of  
   newCoop?
]


;;;;;;;;;;;;;;;;;;;;;;;;
;;; Setup Procedures ;;;
;;;;;;;;;;;;;;;;;;;;;;;;

to setup
  ca
  ifelse mandala 
  [
    ask patches [
    ifelse (pxcor = 0 and pycor = 0)
       [
         set coop? 0
         set pcolor red
       ]
       [
         set coop? 1
         set pcolor blue
       ]
    ]
  ]
  [
    ask patches [
    ifelse random 101 > percentDefectors
    [set coop? 1]
    [set coop? 0]
    ifelse (coop? = 1)
       [set pcolor blue
       ]
       [set pcolor red
       ]
    
    ]
  ]
    reset-ticks 
end


;;;;;;;;;;;;;;;;;;;;;;;;
;;;  Go Procedures   ;;;
;;;;;;;;;;;;;;;;;;;;;;;;

to go
   
   ask patches [  
      set score 0
   ]
   playPD
   assessStrategy
   updateStrategy
   
   tick
   if stopRun and ticks >= numTicks
    [
      stop
    ]
end


to playPD
    ask patches [  
      set tempScore  0
      ifelse coop? = 0 
      [  
        ask neighbors4
        [
          if [coop?] of self = 1
             [set tempScore tempScore + b] 
        ]
      ]
      [ask neighbors4 
        [
        
          if [coop?] of self  = 1
             [set tempScore tempScore + 1] 
        ]
      ]
      set score tempScore
    ]  
end

to assessStrategy
 ask patches [  
  ask max-one-of neighbors [score]
  [
    set bestNeighborScore [score] of self
    set bestNeighborStrat [coop?] of self
  ]
  ifelse coop? = 0 
      [  
        ifelse bestNeighborScore > [score] of self [
            ifelse (bestNeighborStrat = 1)
               [set newCoop?  1
                set pcolor green] 
               [set newCoop?  0
                set pcolor red]     
            ]
           [set newCoop? 0
            set pcolor red     
            ]
      ]
      [  
        ifelse bestNeighborScore > [score] of self [
            ifelse (bestNeighborStrat = 1)
               [ set newCoop? 1
                 set pcolor blue] 
               [set newCoop?  0
                 set pcolor yellow]     
          ]
        [ set newCoop? 1
            set pcolor blue     
          ]
      ]
 ]    
         
  
end


to updateStrategy
  
    ask patches
    [  
      set coop? newCoop?
    ]
  
end


to recoverMandala 
  ifelse coop? = 0 
      [  
        ifelse bestNeighborScore > [score] of self [
            ifelse (bestNeighborStrat = 1)
               [
                set pcolor green] 
               [
                set pcolor red]     
            ]
           [
            set pcolor red     
            ]
      ]
      [  
        ifelse bestNeighborScore > [score] of self [
            ifelse (bestNeighborStrat = 1)
               [ 
                 set pcolor blue] 
               [
                 set pcolor yellow]     
          ]
        [ 
            set pcolor blue     
          ]
      ]
end







to spreadColor
  diffuse pcolor spread
  ask patches [set pcolor pcolor + Adjust]
  tick
  
  if stopRun and ticks >= numTicksMore
    [
      stop
    ]
  if ticks = 800
    [
      set spread  .8
    ]
  
  
end