Random Walk Periodic Boundary Condition 2D Lattice

1 collaborator

Do Trong Thanh (Author)

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;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; variable declarations ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;

globals
[
  root-mean-square
  sum-distance
  sum-prob
  west-prob-scale
  east-prob-scale
  north-prob-scale
  south-prob-scale
  prob
]

;;;;;;;;;;;;;;;;;;;;;;
;; setup procedures ;;
;;;;;;;;;;;;;;;;;;;;;;

;; set up the patches and creates turtles

to setup
  clear-all
  set-patch-size (200 / boundary)
  resize-world (- boundary) boundary (- boundary) boundary
  ask patches [ set pcolor gray + 3 ]
  init-constant
  setup-turtles
  reset-ticks
end 

to setup-turtles
  crt number-of-particles
  [
    set color black
    pen-down
  ]
end 

to init-constant
  set sum-prob (west-prob + east-prob + north-prob + south-prob)
  set west-prob-scale (west-prob / sum-prob)
  set east-prob-scale (east-prob / sum-prob)
  set north-prob-scale (north-prob / sum-prob)
  set south-prob-scale (south-prob / sum-prob)
end 

;;;;;;;;;;;;;;;;;;;;;;;;
;; runtime procedures ;;
;;;;;;;;;;;;;;;;;;;;;;;;

to go
  ;; have the turtles randomly pick north, south, west, east and
  ;; move in that direction
  ask turtles
  [
    set color blue
    set prob (random-float 1)
    if (prob < west-prob-scale)
    [
      ;; go west
      set heading 270
      forward 1
    ]
    if (prob > west-prob-scale) and (prob < west-prob-scale + east-prob-scale)
    [
      ;; go east
      set heading 90
      forward 1
    ]
    if (prob > west-prob-scale + east-prob-scale) and (prob < west-prob-scale + east-prob-scale + north-prob-scale)
    [
      ;; go north 
      set heading 0
      forward 1
    ]
    if (prob > west-prob-scale + east-prob-scale + north-prob-scale)
    [
      ;; go south
      set heading 180
      forward 1
    ]
    set color black  
  ]
  ;; calculate root mean square of distance of all particles
  set sum-distance 0
  foreach sort turtles
  [
    ask ? [ set sum-distance (sum-distance + (xcor * xcor + ycor * ycor)) ]
  ]
  set root-mean-square (sqrt (sum-distance / (count turtles)))
  tick
end

There are 4 versions of this model.

Uploaded by	When	Description	Download
Do Trong Thanh	almost 12 years ago	Wrong model uploaded, this is correction	Download this version
Do Trong Thanh	almost 12 years ago	Fix heading	Download this version
Do Trong Thanh	almost 12 years ago	Change to wrap world	Download this version
Do Trong Thanh	almost 12 years ago	Initial upload	Download this version

Attached files

File	Type	Description	Last updated
Random Walk Periodic Boundary Condition 2D Lattice.png	preview	Preview for 'Random Walk Periodic Boundary Condition 2D Lattice'	almost 12 years ago, by Do Trong Thanh	Download

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