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MOVIE_12._Endogenous_Network_Structure

powered by NetLogo

view/download model file: MOVIE_12._Endogenous_Network_Structure.nlogo

CODE

          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
          ;;                AGENT_ZERO              
          ;;         MOVIE 12 Code. Version 1.0
          ;;       Endogenous Network Structure
          ;;      
          ;;             Joshua M. Epstein           
          ;;                 May 2011
          ;;                
          ;;      Sliders [102, 0, 4, 1, 1, .2] Seed 1    
          ;;        
          ;:  Note: Dynamic Networks by Affective Homophily.
          ;;        But unlike MOVIE 9 Code, endogenous link 
          ;;        formation and breakage.                        
          ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;              
        


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


to update-links 
  ask red-link 0 1 [
   set thickness 0 + weight
   ifelse weight < link_threshold 
    [hide-link]
    [show-link]] 
  ask red-link 0 2 [
   set thickness 0 + weight
     ifelse weight < link_threshold 
    [hide-link]
    [show-link]]  
  ask red-link 1 0 [
   set thickness 0 + weight
      ifelse weight < link_threshold 
    [hide-link]
    [show-link]]  
  ask red-link 1 2 [
   set thickness 0 + weight
      ifelse weight < link_threshold 
    [hide-link]
    [show-link]] 
  ask red-link 2 0 [
   set thickness 0 + weight
     ifelse weight < link_threshold 
    [hide-link]
    [show-link]]  
  ask red-link 2 1 [
   set thickness 0 + weight
      ifelse weight < link_threshold 
    [hide-link]
    [show-link]] 
end    
  

to setup
  __clear-all-and-reset-ticks
  ;use-new-seed 
  use-seed-from-user
  setup-patches
  setup-turtles
  ;setup-links
  setup-MyLai
 ; movie-start "out.mov"     ; Uncomment block to make movie
 ; movie-grab-view 
 ; repeat 850 
 ;   [ 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 ; random-xcor random-ycor
                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]
                set memory []
                  repeat memory_length 
                    [set memory lput random-float 0 memory]
                ;show memory
               ; set label who
                ]
  ask turtle 2 [                                      
                setxy 3 9 ; random-xcor random-ycor
                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]
  setup-links
  move-turtles
  activate-patches
  ;update-event_count
  update-affect
  update-probability
  update-disposition
  ;update-affect-weights
  update-probability-weights
  ;update-disposition-weights
  update-links
  take-action
  deactivate-patches 
  return-as-yellow
  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 
   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 [  
    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  ; patches in positive quadrant that are not dead
 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 return-as-yellow
  ask patches
     [if random 100 < 1 [set pcolor yellow + random 2]]
     end

to setup-MyLai
  ask patches with [pxcor < -5 or pycor < -2 ]                                          
                  [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-affect-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

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

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