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MOVIE_3._Parable1._Agent_Zero_Joins

powered by NetLogo

view/download model file: MOVIE_3._Parable1._Agent_Zero_Joins.nlogo

CODE

          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
          ;;               AGENT_ZERO                  
          ;;    MOVIE 3 Parable 1 Code. Version 1.0
          ;;           Agent_Zero Joins   
          ;;              
          ;;           Joshua M. Epstein                
          ;;            February 2010               
          ;;         Revised November 2012  
          ;;       Book Sliders [45,0,6,1,1]
          ;;             Book Seed 1              
          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;


to use-new-seed                                  ; Seed generated by NetLogo
  let my-seed new-seed            
  output-print word "Generated seed: " my-seed   ; Print in Command Center window
  random-seed my-seed                            ; Use the new seed
end

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

globals[                         ; The more important of these are set w/sliders.
  inactive-color
  active-color
  destroyed-color 
  link-color
  deactivation-rate              ; Probablitity a patch returns to inactive from active
  maximum-stopping-time
]

to setup-globals
  set inactive-color yellow      ; Small random number is added, in setup-patches, for visualization.
  set active-color orange + 1
  set destroyed-color red - 3
  set deactivation-rate 8
  set link-color red
  set maximum-stopping-time 50000
  end

directed-link-breed [red-links red-link]
links-own [weight]
turtles-own [
            affect
            learning_rate
            lambda
            delta             ; Generalized Rescorla-Wagner exponent                   
            threshold 
            event_count 
            disposition
            probability
            memory           
            ]

to setup-links

   ask turtle 0 [ create-red-link-to turtle 1]
                 ask red-link 0 1 [ 
                 set color link-color
                 set weight 0.3]
   ask turtle 0 [ create-red-link-to turtle 2]
                 ask red-link 0 2 [ 
                 set color link-color
                 set weight 0.3]
   ask turtle 1 [ create-red-link-to turtle 0]
                 ask red-link 1 0 [ 
                 set color link-color
                 set weight 0.3]
   ask turtle 1 [ create-red-link-to turtle 2]
                 ask red-link 1 2 [ 
                 set color link-color
                 set weight 0.3]
   ask turtle 2 [ create-red-link-to turtle 0]
                 ask red-link 2 0 [ 
                 set color link-color
                 set weight 0.3]
   ask turtle 2 [ create-red-link-to turtle 1]
                 ask red-link 2 1 [ 
                 set color link-color
                 set weight 0.3]
end

to setup
  __clear-all-and-reset-ticks
  ;use-new-seed   .  
  use-seed-from-user 
  setup-globals
  setup-patches
  setup-turtles
  setup-links
  ;setup-movie   ; Uncomment to make movie
end

to setup-movie
   movie-start "out.mov"  
   movie-grab-view      ; Show the initial state
   repeat 750           ; Movie length in frames
    [ go 
    movie-grab-view ]
   movie-close
end

to setup-turtles
  set-default-shape turtles "person"
  create-turtles 3  
  ask turtle 0 [
                setxy -9 -9      ; For random positions use random x-cor  random y-cor
                set color blue
                set affect 0.001 ; For delta > 0, if V(0)=0, then V(t)=0 for all t. Hence, small positive init.
                set delta 0
                set lambda 1
                set learning_rate .1
                set threshold .5
                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]    ; This recovers the memory one original model, w/initial estimate the entry.
                ;set memory [0 0 0 0]
                ;set label who      ; Uncomment to have agent number visible
                ]  
                        
  ask turtle 1 [                           
                setxy  5 5 
                set color blue
                set affect 0.001
                set delta 0
                set lambda 1
                set learning_rate .1
                set threshold .5
                set event_count 0
                set disposition 0
                set probability 0
                ;set memory [ 1 3 5 7 8]
                set memory []
                  repeat memory_length 
                    [set memory lput random-float 0 memory]
                ; show memory
                ; set label who
                ]
  ask turtle 2 [                                    
                setxy 3 9                   
                set color blue
                set affect 0.001
                set delta 0
                set lambda 1
                set learning_rate .1
                set threshold .5
                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 0]
                ;set label who
              ]
end
  
to setup-patches
  ask patches [set pcolor inactive-color + random 2]  
end
  
to go                              ; Corresponds to 'main' in C/C++
  if ticks >= maximum-stopping-time [stop]
  move-turtles
  activate-patches
  update-event_count
  update-affect
  update-probability
  update-disposition
  take-action
  deactivate-patches ; Turns them back to inactive from active.
  do-plots1
  do-plots2
  do-plots3
  tick
end

to update-event_count
ask turtles[
    if pcolor = active-color [set event_count event_count + 1]  
           ]
end

to update-affect ; Standard RW for delta=0. Standard logistic for delta=1. General S-curves : 0 < delta < 1
   ask turtles [
        if pcolor = active-color 
           [set affect affect + (learning_rate * (affect ^ delta) * (lambda - affect))]    
        if pcolor != active-color
           [set affect affect + (learning_rate * (affect ^ delta) * extinction_rate *(0 - affect))] 
               ]                           ; Standard RW extinction for extinction_rate=1. Typically use < 1.
end

to update-probability
 ask turtles[
 let current_probability  
        (count patches in-radius spatial_sample_radius with [pcolor = active-color]/(count patches in-radius spatial_sample_radius))
 set memory but-first memory                                      ; Drops leftmost value
 set memory lput current_probability memory                       ; Adds current_prob as rightmost value
 set probability mean memory
 ;set probability median memory        ; Uncomment this, and comment out mean to switch to moving median, and vice versa.
   ]
 end
 
to update-disposition   ; Uses Disposition net of threshold
 ask turtle 0 [
   set disposition affect + probability + [weight] of red-link 1 0 * ([affect] of turtle 1 + [probability] of turtle 1) + 
                                          [weight] of red-link 2 0 * ([affect] of turtle 2 + [probability] of turtle 2) - threshold] ; NetLogo scoping interprets the last as : [threshold] of turtle 0
 ask turtle 1 [
   set disposition affect + probability + [weight] of red-link 0 1 * ([affect] of turtle 0 + [probability] of turtle 0) +
                                          [weight] of red-link 2 1 * ([affect] of turtle 2 + [probability] of turtle 2) - threshold]
 ask turtle 2 [
   set disposition affect + probability + [weight] of red-link 0 2 * ([affect] of turtle 0 + [probability] of turtle 0) +
                                          [weight] of red-link 1 2 * ([affect] of turtle 1 + [probability] of turtle 1) - threshold]               
end

to move-turtles
  ask turtles with [who != 0] [  ; This immobilizes Agent_0
    right random 360             ; Adopt random heading
    forward 1
    ]
end
  
to take-action  
  ask turtles [                                            
    if disposition > 0 [ask patches in-radius action_radius [set pcolor destroyed-color]]
    ]    
end

to activate-patches  ; Patches in specified sector that are not dead
 ask patches with [pxcor > -5 and pycor > -2]
      [if random 1000 < attack_rate and pcolor != destroyed-color [set pcolor active-color]]
end

to deactivate-patches
 ask patches with [pxcor > -5 and pycor > -2]
      [if random 100 < deactivation-rate and pcolor != destroyed-color [set pcolor inactive-color + random 2]]    
end

to do-plots1
    set-current-plot "Disposition"
    set-current-plot-pen "turtle 0"
    plot [disposition] of turtle 0
    set-current-plot-pen "turtle 1"
    plot [disposition] of turtle 1
    set-current-plot-pen "turtle 2"
    plot [disposition] of turtle 2
   end
   
to do-plots2    
    set-current-plot "Probability"
    set-current-plot-pen "turtle 0"
    plot [probability] of turtle 0
    set-current-plot-pen "turtle 1"
    plot [probability] of turtle 1
    set-current-plot-pen "turtle 2"
    plot [probability] of turtle 2
   end

to do-plots3    
    set-current-plot "Affect"
    set-current-plot-pen "turtle 0"
    plot [affect] of turtle 0
    set-current-plot-pen "turtle 1"
    plot [affect] of turtle 1
    set-current-plot-pen "turtle 2"
    plot [affect] of turtle 2
   end