User`s guide

Controller Design Using the Root Locus Design GUI
8-15
The following two figures capture this procedure.
The right-most pair of closed-loop poles seem to be on the imaginary axis.
Actually, they are onlyclose.Let’s use thezoom controlsto improve thisresult.
Zooming
Youcan use the Zoom controls on thelower right ofthe RootLocus DesignGUI
to zoom in on a region o f the locus, or zoom out to show the entire locus.
As you get close to a closed-
loop pole on the locus, the
mouse pointer becomes a hand.
The poles appear to be on the imaginary
axis.