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84 CHAPTER 3. FUNCTIONAL DESCRIPTION OF Xµ
# Nyquist plots
g2 = ctrlplot(sys1g,{nyquist});
g2 = ctrlplot(sys2g,g2,{nyquist});
g2 = ctrlplot(-1,g2,{nyquist,marker=1,line=0});
g2 = plot(g2,{projection="orthographic",...
legend=["sys1","sys3","critical point"],...
title="Nyquist plots"})?
Real
-1 0 1-2 2
Imaginary
-1.5
-1
-0.5
0
-2
0.5
Nyquist plots
sys1
sys3
critical point