Contagion/ Social Influence- Jiawei Fu- Version 2

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Default-person Jiawei Fu (Author)


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;;; Setup Procedures ;;;

to setup
  set-default-shape turtles "circle"
  nw:set-context turtles links
  ;; make the initial network of two turtles and an edge
  make-node nobody        ;; first node, unattached
  make-node turtle 0      ;; second node, attached to first node

;;; Main Procedures ;;;

to go
  ;; new edge is green, old edges are gray
  while [N < number-of-links]
  ask links [ set color gray ]
  make-node find-partner         ;; find partner & use it as attachment
                                 ;; point for new node
  if layout? [ layout ]
  ask one-of turtles [set color green]
  if any? turtles with [color = red]
    ask turtles with [color = green]
      ask link-neighbors [if random 100 <= probability-linked-affected [set color green]
        ask other turtles [
        if random 100 < probability-other-affected [set color green]]

;; used for creating a new node

to make-node [old-node]
  crt 1
    set color red
    if old-node != nobody
      [ create-link-with old-node [ set color green ]
        ;; position the new node near its partner
        move-to old-node
        fd 8
        set N N + 1

to-report find-partner
  report [one-of both-ends] of one-of links

;;; Layout ;;;

;; resize-nodes, change back and forth from size based on degree to a size of 1

to resize-nodes
  ifelse all? turtles [size <= 1]
    ;; a node is a circle with diameter determined by
    ;; the SIZE variable; using SQRT makes the circle's
    ;; area proportional to its degree
    ask turtles [ set size sqrt count link-neighbors ]
    ask turtles [ set size 1 ]

to layout
  ;; the number 3 here is arbitrary; more repetitions slows down the
  ;; model, but too few gives poor layouts
  repeat 3 [
    ;; the more turtles we have to fit into the same amount of space,
    ;; the smaller the inputs to layout-spring we'll need to use
    let factor sqrt count turtles
    ;; numbers here are arbitrarily chosen for pleasing appearance
    layout-spring turtles links (1 / factor) (7 / factor) (1 / factor)
    display  ;; for smooth animation
  ;; don't bump the edges of the world
  let x-offset max [xcor] of turtles + min [xcor] of turtles
  let y-offset max [ycor] of turtles + min [ycor] of turtles
  ;; big jumps look funny, so only adjust a little each time
  set x-offset limit-magnitude x-offset 0.1
  set y-offset limit-magnitude y-offset 0.1
  ask turtles [ setxy (xcor - x-offset / 2) (ycor - y-offset / 2) ]

to-report limit-magnitude [number limit]
  if number > limit [ report limit ]
  if number < (- limit) [ report (- limit) ]
  report number

There is only one version of this model, created over 5 years ago by Jiawei Fu.

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