Resource Dependence

1 collaborator

Jiawei Fu (Author)

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Click to Run Model

Turtles-own [wealth]
globals[number-RDT]

to setup
  clear-all
  create-turtles 50 [set wealth random 100
    set shape "circle"
    set size 2
    setxy random-xcor random-ycor]
  ;make-node-RDT nobody
  ;make-node-RDT turtle 0
  reset-ticks
end 

to go
  ask links [set color gray]
  ask turtles [
  make-node-RDT find-partner] ;[find-partner]
  tick
  if layout? [layout]
end 

to make-node-RDT [old-node]
    if wealth < small-wealth [ 
      if any? old-node with [wealth > large-wealth] [
        create-link-with old-node 
        move-to old-node
        fd 8
        set number-RDT number-RDT + 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 10 years ago by Jiawei Fu.

Attached files

File	Type	Description	Last updated
Resource Dependence.png	preview	Preview for 'Resource Dependence'	over 10 years ago, by Jiawei Fu	Download

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