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+//Example 6 0f question and answer section

+clc;

+clear; close;

+n=-5:.01:5;

+for i=1:length(n)

+    if n(i)<0 then

+        x(i)=0;h1(i)=0;h2(i)=0;

+    else

+        x(i)=1;h1(i)=2;h2(i)=3;

+    end

+    h3(i)=h1(i)+h2(i)//when in parallel

+    h4(i)=h1(i).*h2(i)//when in series

+end

+y1=convol(x,h3);

+y2=convol(x,h4);

+subplot(4,2,1);

+plot(n,x,'black');

+xtitle('x[n]');

+subplot(4,2,2);

+plot(n,h1,'red');

+xtitle('h1[n]');

+subplot(4,2,3);

+plot(n,h2,'red');

+xtitle('h2[n]');

+subplot(4,2,4);

+plot(n,h3,'blue');

+xtitle('h3[n]');

+subplot(4,2,5);

+plot(n,h4,'blue');

+xtitle('h4[n]');

+subplot(4,2,6);

+n1=-10:.01:10;

+plot(n1,y1,'green');

+xtitle('y1[n]');

+subplot(4,2,7);

+n1=-10:.01:10;

+plot(n1,y2,'green');

+xtitle('y2[n]');