Here is a site with several numerical mathematical utilities:

http://www.akiti.ca/Mathfxns.html

For example, it has utilities for solving the Quadratic, Cubic, and Quartic Equations; solving N Equations in N Unknowns; Eigenvalues and Eigenvectors; and more.

In addition to using the posted routines themselves, the references are good too, if anybody is interested in reading more. (And the NETLIB site, too, is a fantastic repository of information and source code.)

Regards,


David