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+//Scilab Code for Example 10.5 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');