Date: 20 Jul 90 15:40:51 GMT
Organization: Computing Systems, Carnegie Mellon, Pittsburgh, PA
Subject: Root Locus Routines


I wrote the following 2 small routines this term for my control systems
class. The programs calculate the exit point of complex roots from
the real axis, and the entry point for complex roots to the real axis,
for Root Locus plots. "Exit" finds the point on the real axis where gain (K)
is maximum. At this point a pair of complex roots leave the real axis.
"Entry" finds the point on a real axis line segment where gain (K) is minimum.
It is at this point that a complex root pair enter the real axis line segment.

Paul
pauld@fs1.ece.cmu.edu
Dept. of Electrical and Computer Engineering
Carnegie-Mellon University
Pittsburgh, PA.

-------------------------------------------------------------------------------
 PROGRAM NAME:    EXIT
 DATE:            7-19-90
 PURPOSE:         Calculate the breakaway point for complex roots from real
                  axis, for Root Locus analysis.
 ARGUMENTS:       Level 4: 'Algebraic expression in terms of "S"'(Capital S)
                  Level 3: Left limit of real axis line segment
                  Level 2: Right limit of real axis line segment
                  Level 1: Desired accuracy (ex: .0001)
