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+//Scilab Code for Example 10.11 of Signals and systems by
+//P.Ramakrishna Rao
+//System Identification
+//Cross Correlation
+clear;
+clc;
+clear x n a y h z;
+x=[1,1,1,1,0,0];
+y=[1,3,6,10,12,12,10,6,3,1];
+h(1)=y(1)/x(1);
+for n=2:7
+ for k=1:n-1
+ z(k)=(h(k)*x(n-k));
+ h(n)=(y(n)-sum(z));
+ end
+end
+disp(h,'h(n)');
+n=1:7;
+a=gca();
+a.x_location="origin";
+a.y_location="origin";
+plot2d3(n,h,-4);
+title('System Response h(n)');