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+//Scilab Code for Example 10.2 of Signals and systems by
+//P.Ramakrishna Rao
+//Cross Correlation
+clear;
+clc;
+x=[4,-2,2,0,4];
+y=[0,3,0,-3,6];
+//computation of cross correlation sequence;
+n1 = max(size(y))-1;
+n2 = max(size(x))-1;
+r = xcorr(x,y,n1);
+n=-4:4;
+a=gca();
+a.x_location="origin";
+a.y_location="origin";
+plot2d3(n,r,-9);
+title('rxy_cross-correlation');