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//Example 3.21
//Determine the response of the below relaxed system.
clc;
close;
n=-10:.01:10;
for i=1:length(n)
if n(i)<0 then
h(i)=0;x(i)=0;
else
h(i)=(1/3)^n(i);
x(i)=2^n(i);
end
end
y=convol(h,x);
//figure
f=scf(0);
plot(n,h,'black');
xtitle('input response1','n','h(n)');
xs2jpg(0, 'problem29-plot-a.jpg');
// figure
f=scf(1);
plot(n,x,'red');
xtitle('input response2','n','x(n)');
xs2jpg(1, 'problem29-plot-b.jpg');
// figure
f=scf(2);
n1=-20:.01:20;
plot(n1,y,'green');
xtitle('output response','n','y(n)');
xs2jpg(2, 'problem29-plot-c.jpg');
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