Create Uncertain LTI Dynamics

You can create a 1-by-1 (scalar) positive-real uncertain linear dynamics element, whose frequency response always has real part greater than -0.5. Set the SampleStateDim property to 5. Plot a Nyquist plot of 30 instances of the element.

g = ultidyn('g',[1 1],'Type','Positivereal','Bound',-0.5);
g.SampleStateDim = 5;
nyquist(usample(g,30))
xlim([-2 10])
ylim([-6 6]);

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