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+//Example 4.24
+//Convolution of x(t) and h(t)
+clc
+clear
+t1=-3:0.01:10;
+t2=1:0.01:10;
+t3=-2:0.01:20;
+a=0.5//assume a=0.5
+for i=1:length(t1)
+    x(i)=exp(-a*t1(i));
+end
+for j=1:length(t2)
+ h(j)=exp(-a*t2(j));
+end
+y=convol(x,h);
+subplot(3,1,1)
+xtitle("input signal x(t)","....................t","x[t]");
+plot(t1,x);
+subplot(3,1,2)
+xtitle("system response h(t)","....................t","h[t]");
+plot(t2,h);
+subplot(3,1,3)
+xtitle("output signal y(t)",".............................t","y[t]");
+plot(t3,y);