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+//Find the covolution Of the following signals.

+//Example 4.9

+clc;

+clear;

+close;

+t=-10:.01:10;

+//input signal:x(t)=u(t-3)-u(t-5)

+for i=1:length(t)

+    if t(i)<3 | t(i)>5 then

+        x(i)=0;

+    else 

+        x(i)=1;

+    end

+    //h(t)=exp(-3*t)*u(t)

+    if t(i)>=0 then

+    h(i)=exp(-3.*t(i));

+else

+    h(i)=0;

+end

+end

+y=convol(h,x);//cconvolution of the above two signals

+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=-20:.01:20;

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

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