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+//Scilab Code for Example 5.14 of Signals and systems by
+//P.Ramakrishna Rao
+//Circular Convolution
+clear;
+clc;
+close;
+//First Causal sequence
+x=[1,1,1,1;1,-%i,-1,%i;1,-1,1,-1;1,%i,-1,-%i]
+y1=[1;2;3;4];
+y2=[4;3;2;1];
+X=x*y1;
+disp(X,'Vector X(0)-->X(3)')
+Y=x*y2;
+disp(Y,'Vector Y(0)-->Y(3)')
+for n=1:4;
+    Z(n,1)=X(n,1)*Y(n,1);
+end
+q=4*x^-1;
+disp(q,'IDFT matrix ');
+z=0.25*q*Z;
+disp(z,'IDFT of Vector Z(0)-->Z(3)')