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+//Example 2_1
+//Find the convolution of two continous time signal
+clc;
+t=-8:1/100:8;
+for i=1:length(t)
+x(i)=exp(-t(i)^2);
+h(i)=3*t(i)^2;
+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');