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diff --git a/29/CH12/EX12.27/exa12_27.sce b/29/CH12/EX12.27/exa12_27.sce
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+//caption:gain_and_phase_margin
+//example 12_27
+//page543
+clf();
+s=%s;
+s1=-s;
+disp("for K=0.5")
+g=(0.5)/(s*(s+1)^2);
+GH=syslin('c',g);
+nyquist(GH);
+//mtlb_axis([-5 1  -500 500]);
+xtitle('Nyquist plot of (2.5*3)/(s*(0.4*s+1)*(0.2*s+1))')
+pm=p_margin(GH)
+disp(pm,"phase margin=")
+gm=g_margin(GH)
+disp(gm,"gain margin=")
+\ No newline at end of file