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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]');