User`s guide

7 Control Design Tools
7-4
If you are interested in just the root locus plot, use the command rlocus.This
command takes one argument: a SISO model of the open loop system, created
with
ss, tf,orzpk. In the tracking loop depicted on the previous page, this
model would represent . You can also use the function
rlocfind to
select a point on the root locus plot and determine the corresponding gain .
The following table summarizes the commands for root locus design.
Root Locus Design
pzmap
Pole-zero map.
rltool
Root Locus Design GUI.
rlocfind
Interactive root locus gain selection.
rlocus
Evans root l oc us pl ot.
sgrid
Continuous grid for root locus.
zgrid
Discrete grid for root locus.
Ps
()
Hs
()
k
ω
n
ζ,
ω
n
ζ,