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+//Scilab Code for Example 9.6 of Signals and systems by

+//P.Ramakrishna Rao

+clc;

+clear;

+clear z x y t T;

+A=1;

+n=1;

+wo=2*%pi;

+theta=%pi/2;

+for t=-5:0.01:5;

+    x(n)=A*cos(wo*t+theta);

+    n=n+1;

+end

+t=-5:0.01:5;

+plot(t,x);

+title('x(t)');

+n=1;

+for T=-5:0.1:5;

+    z(n)=(A^2/2)*cos(wo*T);

+    n=n+1;

+end

+figure(1);

+T=-5:0.1:5;

+plot(T,z);

+title('Rxx(T)');

+xlabel('t in seconds')