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Download - Wolfram Research

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90 2. Tutorial<br />

In[14]:= RootLocusPlot[H4[s, a],{a, 3, 5},<br />

PoleStyle −> PlusMark[0.03, Hue[1−0.3*#] &,<br />

Thickness[0.012]],<br />

ZeroStyle −> PointMark[0.03, Hue[0.5−0.3*#] &,<br />

Thickness[0.005]]]<br />

a = 3.000e0 .. 5.000e0 (0% .. 100%)<br />

2.0E0<br />

Im s<br />

Poles<br />

0%<br />

-2.0E0 -1. -0.5<br />

1.<br />

-1.<br />

Re s<br />

100%<br />

Zeros<br />

0%<br />

-2.0E0<br />

100%<br />

Out[14]= Graphics <br />

Pole-Zero Plots of Transfer Functions Without Parameters<br />

The RootLocusPlot function can also be used to display the pole and zero locations of transfer<br />

functions without parameters. For this purpose, RootLocusPlot must be called with a univariate<br />

transfer function, and no parameter interval must be passed as a second argument.<br />

In[15]:= RootLocusPlot[H3[s]]<br />

Im s<br />

2.0E0<br />

1.<br />

-5.0E0 -2.0E0 -1. -0.5<br />

Re s<br />

-1.<br />

-2.0E0<br />

Out[15]= Graphics

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