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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');