# Random Walk Periodic Boundary Condition

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;;;;;;;;;;;;;;;;;;;;;;;;;;; ;; variable declarations ;; ;;;;;;;;;;;;;;;;;;;;;;;;;;; globals [ sum-distance root-mean-square ] ;;;;;;;;;;;;;;;;;;;;;; ;; setup procedures ;; ;;;;;;;;;;;;;;;;;;;;;; ;; set up the patches and creates turtles to setup clear-all set-patch-size (200 / boundary) resize-world (- boundary) boundary 0 (boundary * 2) ask patches [ set pcolor gray + 3 ] setup-turtles reset-ticks end ;; determines the number of turtles and their color to setup-turtles ;; the origin is at the bottom of the view so there is no need ;; to relocate the turtles upon creation crt number-of-particles [ set color black ;; set pen-size 3 set heading 0 pd ] end ;;;;;;;;;;;;;;;;;;;;;;;; ;; runtime procedures ;; ;;;;;;;;;;;;;;;;;;;;;;;; to go if any? turtles with [ patch-at 0 1 = nobody ] [ ask turtles [ set ycor 0 ] clear-drawing ] ;; have the turtles randomly pick either right or left and ;; move in that direction ask turtles [ ifelse ((random-float 1) < left-probability ) [ ;; go left set heading 90 forward 1 set heading 0 forward 1 ] [ ;; go right set heading 270 forward 1 set heading 0 forward 1 ] ;; set the color of the turtles to give a rough idea of how many turtles ;; are at each location -- the lighter the color, the greater the number ;; of turtles set color scale-color blue (count turtles-here) (number-of-particles / 5) 0 ] ;; calculate root mean square of distance of all particles set sum-distance 0 foreach sort turtles [ ask ? [ set sum-distance (sum-distance + xcor * xcor) ] ] set root-mean-square (sqrt (sum-distance / (count turtles))) tick end

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## Attached files

File | Type | Description | Last updated | |
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Random Walk Periodic Boundary Condition.png | preview | Preview | over 10 years ago, by Do Trong Thanh | Download |

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