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MOVIE_9._Endogenous_Network_Weights

powered by NetLogo

view/download model file: MOVIE_9._Endogenous_Network_Weights.nlogo

CODE

          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 
          ;;            AGENT_ZERO
          ;;     MOVIE 9 Code. Version 1.0
          ;;     Endogenous Network Weights 
          ;;             
          ;;         Joshua M. Epstein           
          ;;             May 2011            
          ;:         Dynamic Networks               
          ;;                by                         
          ;;      Affective Homophily
          ;;  Symmetric weights due to Abs Val            
          ;;             
          ;;   Sliders [25, 0, 4, 1, 1] Seed: 1
          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

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

directed-link-breed [red-links red-link]

links-own [weight]

turtles-own [
            affect
            learning_rate
            lambda
            delta                               
            threshold 
            event_count 
            disposition
            probability
            memory         
            ]

to setup-links
   ask turtle 0 [ create-red-link-to turtle 1]   ; Weight of 0 on 1
                 ask red-link 0 1 [ 
                 set color red 
                 set weight 0.1
                 ]
   ask turtle 0 [ create-red-link-to turtle 2]
                 ask red-link 0 2 [ 
                 set color red 
                 set weight 0.1]
   ask turtle 1 [ create-red-link-to turtle 0]
                 ask red-link 1 0 [ 
                 set color red 
                 set weight 0.1]
   ask turtle 1 [ create-red-link-to turtle 2]
                 ask red-link 1 2 [ 
                 set color red 
                 set weight 0.1]
   ask turtle 2 [ create-red-link-to turtle 0]
                 ask red-link 2 0 [ 
                 set color red 
                 set weight 0.1]
   ask turtle 2 [ create-red-link-to turtle 1]
                 ask red-link 2 1 [ 
                 set color red 
                 set weight 0.1]
end


to update-links        ; Symmetry assumption obviates need for link ji given link ij 
   ask red-link 0 1 [
   set thickness 0 + weight] 
   ask red-link 1 2 [          
   set thickness 0 + weight]
   ask red-link 2 0 [
   set thickness 0 + weight] 
end    
  

to setup
  __clear-all-and-reset-ticks
  ;use-new-seed 
  use-seed-from-user 
  setup-patches
  setup-turtles
  setup-links
;movie-start "out.mov"  ; Uncomment code block to make movie
;movie-grab-view 
; repeat 750 
   ; [ go 
   ; movie-grab-view ]
   ; movie-close
; tick
end

to setup-turtles
  set-default-shape turtles "person"
  create-turtles 3  
  ask turtle 0 [
                setxy -9 -9
                set color blue
                set affect 0.001 
                set delta 0
                set lambda 1
                set learning_rate .05
                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]         
                ;set memory [0 0 0 0]
                ;set label who
                ]  
                        
  ask turtle 1 [                                     
                setxy  5 5 
                set color blue
                set affect 0.001
                set delta 0
                set lambda 1
                set learning_rate .03
                set threshold .5
                set event_count 0
                set disposition 0
                set probability 0
                ;set memory [ 1 3 5 7 8]  ; Can assign the initial memory string manually. We automate below:
                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 .09
                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 yellow + random 2]  
end
  
to go
  if ticks >= 50000 [stop]
  move-turtles
  activate-patches
  ;update-event_count
  update-affect
  update-probability
  update-disposition
  update-weights
  update-links
  take-action
  deactivate-patches 
  do-plots1
  do-plots2
  do-plots3
  do-plots4
  tick
end

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

to update-affect ; Standard RW for delta=0. Standard logistic for delta=1. General: 0 < delta < 1
   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 + 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]
 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] [
    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 [pxcor > -5 and pycor > -2]
    [if random 1000 < attack_rate and pcolor != red - 3 [set pcolor orange + 1]]
end

to deactivate-patches
 ask patches with [pxcor > -5 and pycor > -2]    
    [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
    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

to do-plots4    
    set-current-plot "Weights"
    set-current-plot-pen "red-link 2 0"
    plot [weight] of red-link 2 0
    set-current-plot-pen "red-link 1 2"
    plot [weight] of red-link 1 2
    set-current-plot-pen "red-link 0 1"
    plot [weight] of red-link 0 1
   end

to update-weights
    ask red-link 2 0 
    [
    set weight ([affect] of turtle 2 + [affect] of turtle 0)*(1 - abs ([affect] of turtle 2 - [affect] of turtle 0)) 
    ]
    ask red-link 0 1                                                                                                 
    [
    set weight ([affect] of turtle 0 + [affect] of turtle 1)*(1 - abs ([affect] of turtle 1 - [affect] of turtle 0))
    ]
    ask red-link 1 2                                                                                                     
    [
    set weight ([affect] of turtle 2 + [affect] of turtle 1)*(1 - abs ([affect] of turtle 2 - [affect] of turtle 1))
    ]
end