Thanks.

Just for the heck of it, here's a modified version to make it prettier.

http://dsh.cs.washington.edu:8000/Projects/04s126/upload/040222-080808.cgi-lib.16703.1.potential.jpg

Red: high potential, Blue: low potential, White lines:
equi-potentials.  My laptop is slow and I didn't have the patience to
wait for it to converge so it's only 2000 iterations.

http://dsh.cs.washington.edu:8000/Projects/04s126/upload/040222-080911.cgi-lib.16829.1.Laplace4.java


I'm putting this up on the "precept6" web site and I'll make you say a
few words about it on Monday :)

Cheers,
Randy


>  I can't say the picture is half so exciting as the planets with crazy music, but here's the picture and code :) 
>   
>  -Tammy 
>   
>  P.S. Again, the code calculates equipotentials for a given fixed potential of 0 on the outer square and 100 on the inner by diving the area to be considered into a finite number of points. In each iteration, it takes for the new potential value at a given point the average of the surrounding 4 potential values (right,left,above,below).