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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 3.7
+
+clc;
+clear; 
+s=%s
+p=poly([1 0.4 0 ],'s','coeff')
+q=poly([0 0.6 1],'s','coeff')
+g=p./q
+disp(g,'the given transfer function is')
+c=g/(1+g)
+disp(c,'the closed loop transfer function is')
+u=c/s
+disp(u,'the in put is unit step signal')
+//standard form od second order system is w^2/s^2+2*zeta*w*s+w^2
+//compaing h with the standard form
+w=1//natural frequency of oscillation
+disp(w,'natural frequency of oscillation in rad/sec')
+zeta=1/(2*w)
+disp(zeta,'the damping ratio is')
+mp=exp((-zeta*%pi)/sqrt(1-(zeta)^2))*100//percentage peak overshoot 
+disp(mp,'percentage peak overshoot in percentage')
+tp=%pi/(w*sqrt(1-(zeta)^2))
+disp(tp,'peak time in seconds')