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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 5.25
+
+clc;
+clear;
+s=poly(0,'s')//defines s as  poly nomial variable
+h=syslin('c',(1/(s*(s+4)*(s^2+4*s+20))))// the given transfer function assigned to variable h assume K=1  
+scf()
+evans(h)
+//the characterstic equation is (s^4+8s^3+36s^2+80s)+K
+//put s=jw and equating real and imaginary parts to calculate K
+K=-(3.2)^4+36*(3.2)^2//the value of w is 3.2
+disp(K,'yhe value of K is;')