kpure - continuous SISO system limit feedback gain

Calling Sequence

g=kpure(sys)

Parameters

• sys : SISO linear system (syslin)
• g : constant

Description

kpure(sys) computes the gains g such that the system sys feedback by g (sys/.g) has poles on imaginary axis.

Examples

s=poly(0,'s');
h=syslin('c',(s-1)/(1+5*s+s^2+s^3))
xbasc();evans(h)
g=kpure(h)
hf=h/.g(1)
roots(denom(hf))
 

See Also

evans  krac2