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+//Find the covolution Of the following signals.

+//Example 4.12 <i>

+clc;

+clear;

+close;

+t=-5:.01:5;

+for i=1:length(t)

+    if t(i)>=0 & t(i)<=2 then

+    x(i)=sin(%pi*t(i));

+else

+    x(i)=0;

+    end

+if t(i)<1 | t(i)>3 then

+    h(i)=0;

+else

+    h(i)=1;

+end

+end

+y=convol(h,x);//convolution of the above two signals is done here.

+subplot(3,1,1);

+plot(t,h,'red');

+xtitle('input response 2','t','h[t]');

+subplot(3,1,2);

+plot(t,x,'blue');

+xtitle('input response 2','t','x[t]');

+subplot(3,1,3);

+t1=-10:.01:10;

+plot(t1,y,'green');

+xtitle('output response','t','y[t1]');

+//Find the covolution Of the following signals.

+//Example 4.12 <ii>

+clc;

+clear;

+close;

+t=-5:.01:5;

+for i=1:length(t)

+    if t(i)<0  then

+        x(i)=0;

+    elseif  t(i)<1 then

+        x(i)=1+t(i);

+    elseif t(i)<2 then

+    x(i)=1-t(i);

+else

+    x(i)=0;

+end

+if t(i)<0 | t(i)>2 then

+    h(i)=0;

+else

+    h(i)=1;

+end

+end

+y=convol(h,x);

+subplot(3,1,1);

+plot(t,h,'red');

+xtitle('input response 2','t','h[t]');

+subplot(3,1,2);

+plot(t,x,'blue');

+xtitle('input response 2','t','x[t]');

+subplot(3,1,3);

+t1=-10:.01:10;

+plot(t1,y,'green');

+xtitle('output response','t','y[t1]');