GSP by Bill Finzer
Random Walk


Somewhat surprisingly, Sketchpad can model random phenomena. Interpreted as a statement of probablity, the common geometric phrase "given a point on line X" indicates a point chosen at random from a uniform distribution of possible points on X.

Sketchpad's Point on Object command constructs a point at a randomly-chosen location 0n the selected object. You can take advantage of this to explore a variety of mathematical issues concerning randomness and probability.

Modeling a Random Walk

The Situation: The Errant Android

A robot's processor has gone haywire so that the robot cannot walk in a straight line. Each time the robot goes to take a step, it choose a direction completely at random. Each step it takes has the same length. We are interested in a model that will show how far the robot gets on the average after a given number of steps.

Begin your random walk on the next page.

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