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//ex_39check if y[n]=x[k*n] is time invariant
clear;
clc;
s = 2;//shift
x=[1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9];
T=length(x);
k=3;
for n=1:T/k
y(n)=x(k*n);
end
T=5;
Ip = x(T-s);
Op = y(T-s);
if(Ip == Op)
disp(' Time In-variant system');
else
disp('Time Variant system');
end
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