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+//Example 2_15
+//Find the convolution of two sequences
+clc
+n=-8:1:8;
+for i=1:length(n)
+x(i)=exp(-n(i)^2);
+h(i)=3.*n(i)^2;
+end
+y=convol(x,h);
+figure
+plot2d3(n,h);
+title('Impulse responce');
+figure
+plot2d3(n,x);
+title('Input signal');
+figure
+n1=-16:1:16
+plot2d3(n1,y);
+title('Output signal');