g_margin

g_margin

g_margin — gain margin

Calling sequence

[gm [,fr]]=g_margin(h)

Parameters

`h`	: `syslin` list representing a linear system in state-space or transfer form

Description

returns gm, the gain margin in dB of h (SISO plant) and fr, the achieved corresponding frequency in hz. The gain margin is values of the system gain at points where the nyquist plot crosses the negative real axis.

Examples



h=syslin('c',-1+%s,3+2*%s+%s^2)
[g,fr]=g_margin(h)
[g,fr]=g_margin(h-10)
nyquist(h-10)

See also

p_margin, black, chart, nyquist