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+//Scilab Code for Example 5.9(i) of Signals and systems by
+//P.Ramakrishna Rao
+clc;
+clear;
+q=0;
+a1=0.5
+a2=-0.5;
+n=1:101;
+x1=a1^n;
+x2=a2^n;
+w=2;
+n=0:100;
+z=(exp(-%i*w*n));
+for n=0:33;
+    X(n+1)=z(n+1)*x1(3*n+1);
+    q=X(n+1)+q;
+end
+disp(q,'Y1(e^2j) at a=0.5');
+for n=0:33;
+    X(n+1)=z(n+1)*x2(3*n+1);
+    q=X(n+1)+q;
+end
+disp(q,'Y1(e^2j) at a=-0.5');