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+//Scilab Code for Example 10.8 of Signals and systems by

+//P.Ramakrishna Rao

+//Auto Correlation

+clear;

+clc;

+clear x n a;

+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');