The Arena Applet

D. Joyce, J. Kennison, N. Thompson
Departments of Mathematics and Psychology
Clark University
May, 2002


The Arena Applet. See below for an explanation.


This is like the second Genebat Applet, but has a few modifications.

Many arenas of players

The herds are back! In terms of the game/player strategy, the herds are arenas that the players meet in. They're arranged in a circle. You can set the number of arenas to up to 100. Players usually stay in the same arena, but you can set the frequency that they should migrate to the neighboring arenas, and you can set the size of the bands that move between arenas.

The genes

There are 23 genes. Each one is a probability.
  1. The probability of defecting on the first move
  2. The probability of leaving if the partner just cooperated
  3. The probability of leaving if the partner just defected
  4. The probability of defecting on the second move if both just cooperated
  5. The probability of defecting on the second move if self only just cooperated
  6. The probability of defecting on the second move if partner only just cooperated
  7. The probability of defecting on the second move if both just defected
  8. The probability of defecting if both cooperated on last two moves
  9. The probability of defecting if both cooperated on last move, but partner did not on previous
  10. The probability of defecting if both cooperated on last move, but self did not on previous
  11. The probability of defecting if both cooperated on last move, but neither did not on previous
  12. The probability of defecting if partner defected last move, but both cooperated on previous
  13. The probability of defecting if partner defected last move and previous (but not self)
  14. The probability of defecting if partner defected last move, but self did not on previous
  15. The probability of defecting if partner defected last move, and both did previous
  16. The probability of defecting if self defected last move, but both cooperated on previous
  17. The probability of defecting if self defected last move and previous
  18. The probability of defecting if self defected last move, but self did not on previous
  19. The probability of defecting if self defected last move, and both did previous
  20. The probability of defecting if both defected last move, but both cooperated on previous
  21. The probability of defecting if both defected last move, and parner on previous
  22. The probability of defecting if both defected last move, but self on previous
  23. The probability of defecting if both defected last move, and both did previous

The files for this applet are listed here. The Arena.html
file is this file you're looking at. The *.java files
are the program source files for the applet. The *.class
files are the compiled files that run when the applet is
running. They're all needed to run the applet.

My way Or The Highway: Introduction

David E. Joyce,
John Kennison,
both of the Department of Mathematics and Computer Science,
and Nicholas Thompson,
of the Frances L. Hiatt School of Psychology.
Clark University
Worcester, MA 01610