3838/CH7/EX7.2.d/EX7_2_D.sce


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//Example 7.2.D
clc;
syms a z n;
x=(0.5)^(n);
X=symsum(x*(z^-n),n,0,%inf);
d=0.8^(n);
D=symsum(d*(z^-n),n,-(%inf),-1);
disp(D+X,'X(z)=');