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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 5.24
+
+clc;
+clear;
+s=poly(0,'s')//defines s as  poly nomial variable
+h=syslin('c',(s+9)/(s*(s^2+4*s+11)))//the given transfer function assigned to variable h assume K=1
+scf()
+evans(h)
+//the characterstic equation is (s^3+4s^2+11s)+Ks+9K
+//put s=jw and equating real and imaginary parts to calculate K
+K=(4*(4.4)^2)/9//the value of w is 4.4
+disp(K,'the value of K is;')
+
+
+
+
+