p_margin

p_margin — phase margin

Calling sequence

[phm,fr]=p_margin(h)  
phm=p_margin(h)

`h`	: SISO linear system (`syslin` list).
`phm`	: phase margin (in degree)
`fr`	: corresponding frequency (hz)

The phase margin is the values of the phase at points where the nyquist plot of h crosses the unit circle.



h=syslin('c',-1+%s,3+2*%s+%s^2)
[p,fr]=p_margin(h)  
[p,fr]=p_margin(h+0.7)  
nyquist(h+0.7)
t=(0:0.1:2*%pi)';plot2d(sin(t),cos(t),-3,'000')

S. S.