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//EXAMPLE 2.31, Stability for causal system.
//h[i]=impulse response of LTI system.
clear;
clc;
n= -5:0.001:5;
a=0.6;
for i=1:length(n)
if (n(i)<0)
h(i)=0;
else
h(i)=abs(a^n(i));
end
end
S=sum(h);
if(S<%inf)
disp('BIBO stable system');
else
disp('BIBO unstable system');
end
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