# Random Walk Periodic Boundary Condition 2D Lattice

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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

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## Attached files

File | Type | Description | Last updated | |
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Random Walk Periodic Boundary Condition 2D Lattice.png | preview | Preview for 'Random Walk Periodic Boundary Condition 2D Lattice' | over 10 years ago, by Do Trong Thanh | Download |

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