i'm trying to add complex number support for a open source program called Lon-Capa made by Michigan State University. Lon-Capa is an online homework submission system. they used perl to make it, and in the way that you define your problems. They use perl script to define how problems are randomly generated. I can't just use a module to make lon-capa understand complex numbers because if i did my problems wouldn't be compadible with lon-capa anymore. What i can do, however, is write a perl library file to do any math that capa doesn't already do. unless you guys know a better way.. hahahahhaa