10 Problem A8.11 OGATA 4ed(Nyquist plot)

Laplace.T	Root-locus	Transient response	Frecuency response

10 Problem A8.11 OGATA 4ed(Nyquist plot)
Let's draw the Nyquist plot by Scilab.

$\begin{displaymath}G(s)=\frac{20 \cdot (s^{2}+s+0.5)}{s\cdot(s+1) \cdot(s+10)}\end{displaymath}$
Scilab program
clf;

s=%s/(%pi*2);

g=20*(s^2+s+0.5)/(s*(s+1)*(s+10));

gs=syslin('c',g);

nyquist(gs);

mtlb_axis([-2 3 -3 3]);