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+//Scilab Code for Example 10.4 of Signals and systems by
+//P.Ramakrishna Rao
+//Auto Correlation
+clear;
+clc;
+x=[-1,1,-1];
+//computation of auto correlation sequence;
+r = xcorr(x);
+n=-2:2;
+a=gca();
+a.x_location="origin";
+a.y_location="origin";
+plot2d3(n,r,-9);
+title('rxx_auto-correlation');