If you didn't know, Cleve has written two electronic books on using MATLAB for mathematics. The "Numerical Computing with
MATLAB" book is also available in traditional print format. They come with a wealth of MATLAB examples, some of which are
suitable for high school students (in "Experiments with MATLAB"). You were able to download the example code from their web
pages before, but now, if you have R2012b, you can install the examples as an App with a single click!
Here are a couple of my favorites from his examples.
Experiments with MATLAB - OrbitsNumerical Computing with MATLAB - WalkerComments
Let us know what you think here or leave a comment for Cleve.