Random Grid Walk Example

1 collaborator

Uri Wilensky (Author)

WHAT IS IT?

This code example is a demo of a basic random walk, constrained to lie on a grid. At each step, the yellow turtle changes its heading randomly, but always in multiples of 90, so the turtle is always facing due north, east, south, or west. At each step, the turtle always lands on the center of a patch.

Two slightly different kinds of walk are demonstrated:

In WALK1, the turtle's heading at each time step is completely random.
In WALK2, the turtle never makes an immediate about face (180 degree turn). Thus, it will tend to proceed in one direction for longer. This is more similar to how a person or animal might wander.

THINGS TO NOTICE

The monitors show that the turtle's xcor and ycor are always exact multiples of 1.0. That means that the turtle is always on a patch center.

RELATED MODELS

Random Walk Example - shows a freer random walk which does not follow a grid

Comments and Questions

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Click to Run Model

to setup
  clear-all
  crt 1                                 ;; create one turtle
  [
    set color orange
    set size 3                          ;; make it easier to see
    face one-of neighbors4              ;; face N, E, S, or W
    pen-down                            ;; have it draw its path
  ]
  reset-ticks
end 

to walk1
  ask turtles [
    face one-of neighbors4              ;; face N, E, S, or W
    forward 1                           ;; advance one step
  ]
  tick
end 

to walk2
  ask turtles [
    rt one-of [-90 0 90]                ;; go left, straight, or right
    forward 1                           ;; advance one step
  ]
  tick
end 


; Public Domain:
; To the extent possible under law, Uri Wilensky has waived all
; copyright and related or neighboring rights to this model.

There are 10 versions of this model.

Uploaded by	When	Description	Download
Uri Wilensky	over 12 years ago	Updated to NetLogo 5.0.4	Download this version
Uri Wilensky	almost 13 years ago	Updated version tag	Download this version
Uri Wilensky	over 13 years ago	Updated to NetLogo 5.0	Download this version
Uri Wilensky	about 15 years ago	Updated from NetLogo 4.1	Download this version
Uri Wilensky	about 15 years ago	Updated from NetLogo 4.1	Download this version
Uri Wilensky	about 15 years ago	Updated from NetLogo 4.1	Download this version
Uri Wilensky	about 15 years ago	Updated from NetLogo 4.1	Download this version
Uri Wilensky	about 15 years ago	Model from NetLogo distribution	Download this version
Uri Wilensky	about 15 years ago	Random Grid Walk Example	Download this version
Uri Wilensky	about 15 years ago	Random Grid Walk Example	Download this version

Attached files

File	Type	Description	Last updated
Random Grid Walk Example.png	preview	Preview for 'Random Grid Walk Example'	over 12 years ago, by Uri Wilensky	Download

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