ROOT-LOCUS COMPUTER PROGRAM OFFERS DESIGN FLEXIBILITY.

A program is presented which allows data entry simply as the open-loop poles and zeroes and the system dc gain. Changing p-z locations is easily accomplished by new data entry, without the necessity of an auxiliary calculations. The poles and zeroes of a system to be analyzed are generally available from the derivation of the open-loop transfer function; obtaining the polynomial coefficients usually involves additional work. Also, the program works for either positive- or negative-feedback systems.