# Contagion/ Social Influence- Jiawei Fu- Version 2

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;;;;;;;;;;;;;;;;;;;;;;;; ;;; Setup Procedures ;;; ;;;;;;;;;;;;;;;;;;;;;;;; globals[N] extensions[nw] to setup clear-all 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 reset-ticks end ;;;;;;;;;;;;;;;;;;;;;;; ;;; 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 tick 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]] ] ] ] end ;; 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 ] ] end to-report find-partner report [one-of both-ends] of one-of links end ;;;;;;;;;;;;;; ;;; 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 ] ] end 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) ] end to-report limit-magnitude [number limit] if number > limit [ report limit ] if number < (- limit) [ report (- limit) ] report number end

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

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