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//Scilab Code for Example 10.8 of Signals and systems by
//P.Ramakrishna Rao
//Auto Correlation
clear;
clc;
function [y]=u(t)
if t>=0
y=1
else y=0
end
endfunction
k=1;
a=0.8;
for n=-30:30;
x(k)=a^(n)*u(n);
k=k+1;
end
length(x)
//computation of auto correlation sequence;
r = xcorr(x);
n=-60:60;
a=gca();
a.x_location="origin";
a.y_location="origin";
plot2d3(n,r,-4);
title('rxx_auto-correlation');
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