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+//Example 2.5
+//(b) step response of pendulum
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+
+//------------------------------------------------------------------
+//Pendulum parameters
+m=0.5;
+l=1;
+g=9.81;
+
+// Transfer function
+s=%s;
+sys=syslin('c',(1/(m*l^2))/(s^2+g/l));
+
+//step response to u=500;
+t=0:0.02:10;
+theta=csim('step',t,sys);
+plot(t,theta*57.3);
+
+//Title, labels and grid to the figure
+exec .\fig_settings.sci; // custom script to set figure properties
+title('Response of pendulum to a step input in the applied torque',...
+'fontsize',3);
+xlabel('Time t (sec.)','fontsize',2);
+ylabel('Pendulum angle (degree)','fontsize',2);
+
+//------------------------------------------------------------------