This program simulates an Ehrenfest's Urn Markov chain.
At each iteration, a ball is chosen uniformly at random and moved
to the other Urn.
The CURRENT STATE is the number of balls in Urn #1.
Keyboard shortcuts (you might need to **click** on the canvas first):
**'0-9'** to change the simulation speed
(**'1'** for one-step-at-a-time),
or **'+'** or **'-'** to increase/decrease the total number of balls,
or **'r'** to restart.

This program is written by Jeffrey Rosenthal. See also my other JavaScript, my Stochastic Processes book, and my Java Applets.