ntwk-build-simple.nlogo

;; *********************
;; Patrik Wikstrom
;; QUT 2013
;;
;; Simple network generation model
;; Vary ratio new connections based on friendship or random
;; *********************


;; This procedure is used in the setup to create the fully connected network
to create-a-random-link
  let turtle-a one-of turtles
  let turtle-b one-of turtles
  ask turtle-a [
    ifelse link-neighbor? turtle-b or turtle-a = turtle-b [create-a-random-link]
    [create-link-with turtle-b]
  ]
end

to setup
  clear-all
  set-default-shape turtles "circle"
  crt connect [ setxy random-xcor random-ycor]
  
  ;; make the network look pretty
  while [(2 * count links) < (count turtles * (count turtles - 1)) ] [
    create-a-random-link   
    layout-spring (turtles with [any? link-neighbors]) links 0.4 6 1
  ]  
  reset-ticks
end


to create-new-node [new-links]
  let next-node one-of turtles
  let friend-nodes [link-neighbors] of next-node
  let nnn 0
  crt 1 [
    setxy random-xcor random-ycor
    create-link-with next-node
    while [count link-neighbors < new-links] [
      ifelse new-links < count friend-nodes [set nnn new-links][set nnn count friend-nodes]
 
      ifelse random 100 < randomness
      [
        set next-node one-of turtles ;; formation strategy #1
      ]
      [
        set next-node one-of (max-n-of nnn friend-nodes [count link-neighbors]) ;; formation strategy #2
      ]

      if not (link-neighbor? next-node or self = next-node) [create-link-with next-node]
      set friend-nodes [link-neighbors] of next-node
    ]
  ]
end

to go
  create-new-node connect
  
  ; make the network look pretty
  layout-spring (turtles with [any? link-neighbors]) links 0.4 6 1
    
  tick
  if ticks > 1000 [stop]
end
@#$#@#$#@
GRAPHICS-WINDOW
164
18
411
286
16
16
7.2
1
10
1
1
1
0
0
0
1
-16
16
-16
16
1
1
1
ticks
30.0

BUTTON
23
88
152
121
reset network
setup
NIL
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

BUTTON
23
158
152
191
lots of nodes
go
T
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

PLOT
418
18
797
286
histo
degree
nodes
0.0
30.0
0.0
500.0
true
false
"set-plot-x-range connect 100\nset-plot-y-range 0 count turtles\nset-plot-pen-interval 1" ""
PENS
"default" 2.0 1 -13210332 true "" "histogram [count link-neighbors] of turtles"

SLIDER
22
18
152
51
randomness
randomness
0
100
50
1
1
NIL
HORIZONTAL

BUTTON
23
123
152
156
add single node
go
NIL
1
T
OBSERVER
NIL
NIL
NIL
NIL
1

MONITOR
418
290
480
335
nodes
count turtles
0
1
11

MONITOR
715
290
797
335
avg degree
count links / count turtles
0
1
11

MONITOR
483
290
573
335
max-friends
[count link-neighbors] of max-one-of turtles [count link-neighbors]
0
1
11

MONITOR
575
290
710
335
nodes w few friends
count turtles with [count link-neighbors = connect]
0
1
11

SLIDER
22
53
152
86
connect
connect
0
10
3
1
1
NIL
HORIZONTAL

@#$#@#$#@
## WHAT IS IT?

(a general understanding of what the model is trying to show or explain)

## HOW IT WORKS

(what rules the agents use to create the overall behavior of the model)

## HOW TO USE IT

(how to use the model, including a description of each of the items in the Interface tab)

## THINGS TO NOTICE

(suggested things for the user to notice while running the model)

## THINGS TO TRY

(suggested things for the user to try to do (move sliders, switches, etc.) with the model)

## EXTENDING THE MODEL

(suggested things to add or change in the Code tab to make the model more complicated, detailed, accurate, etc.)

## NETLOGO FEATURES

(interesting or unusual features of NetLogo that the model uses, particularly in the Code tab; or where workarounds were needed for missing features)

## RELATED MODELS

(models in the NetLogo Models Library and elsewhere which are of related interest)

## CREDITS AND REFERENCES

(a reference to the model's URL on the web if it has one, as well as any other necessary credits, citations, and links)
@#$#@#$#@
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airplane
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circle
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circle 2
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fish
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flag
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flower
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house
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leaf
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line
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line half
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pentagon
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person
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plant
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sheep
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square
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square 2
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star
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target
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tree
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triangle
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triangle 2
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truck
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Polygon -7500403 true true 296 193 296 150 259 134 244 104 208 104 207 194
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Circle -16777216 true false 234 174 42
Rectangle -7500403 true true 181 185 214 194
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turtle
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wheel
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wolf
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x
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@#$#@#$#@
NetLogo 5.2-RC3
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default
0.0
-0.2 0 0.0 1.0
0.0 1 1.0 0.0
0.2 0 0.0 1.0
link direction
true
0
Line -7500403 true 150 150 90 180
Line -7500403 true 150 150 210 180

@#$#@#$#@
0
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