UPDATE:

It looks like the service I'm using as my public server broke all their links today. The new link are of this form:
http://dl.dropbox.com/u/39904/Blog%20Datasets/Sys3/sys3.m
instead of:
http://dl-client.getdropbox.com/u/39904/Blog%20Datasets/Sys3/sys3.m
The pattern to get the new links from the old ones is to just delete "-client" and "get". Hopefully they will restore the old links since I had posted files on many pages.

Click on the text to see it full size (I had to copy and paste screenshots to keep the formulas). Here's parts 1, 2, and 3 in pdf format, which may be easier to read.

Be sure to read Part 1: Simplex first. Even if you are familiar with a probability simplex, it sets up the example.