Software Download

The textbook is supported by software that permits students to explore the code and perfrom 'what if' analysis. The software is distributed on the 'chethermo' account on To download the software, click here. You may encounter advertisements that ask you to sign up for content unrelated to We DO NOT require any registration to download the software, so be careful to read any pop-ups, etc.

The software distribution was updated to on 3/30/18. This is a minor update, mainly to fix some bugs in UNFAC LLE. To see a list of changes, since release, visit

The programs are provided in a single windows .zip file. It is recommended that you remove them from the zip file before using them. The zip file can be maintained as a backup. In Windows, open the archive with Windows Explorer, and then drag or copy/paste them into the folder of your choice. If your computer has another zip utility installed that you are not comfortable using, after saving the file to your computer, you can probably find the Windows Explorer by right-clicking on the zip file and using 'Open With...'.

Some users have difficulties with MATLAB if the files are placed on a student computer lab windows desktop. If you find strange behavior, move the files to a regular folder before blaming the software.

Some of the code is developed for MATLAB. A couple of open source MATLAB alternatives exist. If you would like to try these options, see our page on Octave and Scilab.