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//caption:gain_phase_plot
//example 7.17.18
//page 256
k=1;
s=%s;
G=syslin('c',k/(s*(0.5*s+1)*(0.25*s+1)));
// freq range to plot
fmin=0.1;
fmax=7;
black(G, fmin, fmax)
xgrid
xtitle('Gain phase plot')
disp("for GM=8 db, K=2.23")
disp("for PM=20 deg. , K=2.69")
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