cleaned up one example

Author: mfalt

example/delayed_lti_system.jl

@@ -7,13 +7,11 @@ s = tf("s")
 P = delay(0.2) * ss(1/(s+1))
 
 K = 3; Ti = 0.3;
-C = DelayLtiSystem(ss(K*(1 + 1/s)))
+C = ss(K*(1 + 1/s))
 
 ω = exp10.(LinRange(-2,2,500))
 
-L_fr = freqresp(C*P, ω)[:]
-plot(real(L_fr), imag(L_fr), xlim=[-2,1], ylim=[-2,2], title="Nyquist curve")
+nyquistplot(P*C, ω, xlims=(-2,1), ylims=(-2,2), gaincircles=false)
 
 G_yd = feedback(P, C)
-plot(ω, abs.(freqresp(G_yd, ω)[:]), xscale=:log, yscale=:log,
-    title="Transfer function from load disturbances to output.")
+bodeplot(G_yd, ω, plotphase=false, title="Transfer function from load disturbances to output.")