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+//Example 2_2
+//Find the convolution of two continuous time signal
+clc;
+t=-8:1/100:8;
+for i=1:length(t)
+x(i)=3*cos(2.*t(i));
+h(i)=exp(-abs(t(i)));
+end
+y=convol(x,h);
+figure
+plot2d(t,h);
+title('Impulse responce');
+figure
+plot2d(t,x);
+title('Input signal');
+figure
+t2=-16:1/100:16
+plot2d(t2,y);
+title('Output signal');