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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');

+