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+//control systems by Nagoor Kani A
+//Edition 3
+//Year of publication 2015
+//Scilab version 6.0.0
+//operating systems windows 10
+// Example 4.2
+clc;
+clear;
+s=poly(0,'s')//defines s as  poly nomial variable
+h=syslin('c',(75*(1+0.2*s))/(s*(s^2+16*s+100)))//the given transfer function assigned to variable h
+scf(1)
+bode(h,0.1,100)//frequency range
+show_margins(h)
+a=g_margin(h)
+b=p_margin(h)
+disp(a,b,'the gain margin and phase margin  are')