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Supplementary_1._Sub_Thresholds

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view/download model file: Supplementary_1._Sub_Thresholds.nlogo

CODE

          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
          ;;                        AGENT_ZERO 
          ;;        Supplementary Applet 1. Sub_Thresholds. 
          ;; Corresponds to Supplementary Discussion 1 on the Website:
          ;;
          ;;                    A Road Not Taken 
          ;;                                     
          ;;  
          ;;                       Version 1.0 
          ;;               
          ;;                     Joshua M. Epstein  
          ;;                       December 2013  
          ;;                      
          ;;                Sliders [70, 0, 4, 0, 1] Seed 1
          ;;
          ;;  Note: Decomposes Tau into Tau_V + Tau_P.
          ;;  Expresses Action condition as D = (V-Tau_V) + (P-Tau_P) > 0.
          ;;  Action is exactly as in single Tau formulation.
          ;;  But net_V and net_P can now disagree in sign. 
          ;;  Code given is overpowered for demo. Main changes are turtles-own 
          ;;  declaration with two thresholds, and update-disposition code.
          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;  
        


to use-new-seed
  let my-seed new-seed           
  output-print word "Generated seed: " my-seed 
  random-seed my-seed          
end

to use-seed-from-user
  let my-seed read-from-string user-input "Enter a random seed (an integer):"  
  output-print word "User-entered seed: " my-seed 
  random-seed my-seed           
end

turtles-own [
            affect
            learning_rate
            lambda
            delta 
            age                                           
            v_threshold 
            p_threshold
            event_count 
            disposition
            probability
            memory         
            ]


to setup
  __clear-all-and-reset-ticks
  ;use-new-seed 
  use-seed-from-user 
  setup-patches
  setup-turtles
; movie-start "out.mov"    
; movie-grab-view         
; repeat 135 
;    [ go 
;    movie-grab-view ]
;   movie-close
 tick
end

to setup-turtles
  set-default-shape turtles "person"
  create-turtles 1  
  ask turtle 0 [
                setxy 9 9
                set color blue
                set age random 20
                set affect 0.001 
                set delta 0
                set lambda 1
                set learning_rate .1
                set v_threshold 0.25
                set p_threshold 0.75
                set event_count 0
                set disposition 0
                set probability 0
                set memory []
                  repeat memory_length 
                    [set memory lput random-float 0 memory]
                ;set memory [0]                
                ;set memory [0 0 0 0]
                ;set label who
                ]  
end
  
to setup-patches
  ask patches [set pcolor yellow + random 2]  
end
  
to go
  if ticks >= 50000 [stop]
  activate-patches
  update-affect
  update-probability
  update-disposition
   ; take-action
  deactivate-patches 
  do-plots1
  do-plots2
  do-plots3
  ;  print ticks
 tick
end

to update-affect 
   ask turtles [
        if pcolor = orange + 1 
           [set affect affect + (learning_rate * (affect ^ delta) * (lambda - affect))]    
        if pcolor != orange + 1
           [set affect affect + (learning_rate * (affect ^ delta) * extinction_rate *(0 - affect))] 
               ]
end

to update-probability
 ask turtles[
 let current_probability  (count patches in-radius vision with [pcolor = orange + 1]/(count patches in-radius vision))
 set memory but-first memory                                                     
 set memory lput current_probability memory                                
 set probability mean memory
 ;set probability median memory                                          
   ]
 end
 
to update-disposition
 ask turtle 0 [
   set disposition affect - v_threshold + probability  - p_threshold]
end

to move-turtles
  ask turtles [   
    right random 360
    forward 1
    ]
end
  
to take-action  
  ask turtles [                                            
    if disposition > 0 [ask patches in-radius action_radius [set pcolor red - 3]]
    ]    
end

to activate-patches  
 ask patches with [pycor > 0]
      [if random 1000 < attack_rate and pcolor != red - 3 [set pcolor orange + 1]]
end

to deactivate-patches
 ask patches with [ pycor > 0]     
      [if random 100 < 8 and pcolor != red - 3 [set pcolor yellow + random 2]]     
end

to do-plots1
    set-current-plot "Disposition"
    set-current-plot-pen "turtle 0"
    plot [disposition] of turtle 0
   end
   
to do-plots2    
    set-current-plot "Net Probability"
    set-current-plot-pen "turtle 0"
    plot [probability - p_threshold] of turtle 0
   end

to do-plots3    
    set-current-plot "Net Affect"
    set-current-plot-pen "turtle 0"
    plot [affect - v_threshold] of turtle 0
   end