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+//EXAMPLE 2.30
+//Convolution of two sided sequences
+clear;
+clc;
+g=[3 -2 4];//originating at n=-1 
+h=[4 2 -1];//originating at n=0
+q=length(g);
+w=length(h);
+z=q+w-1;
+y0=0;
+for i=1:z;
+    y(i)=0;
+    for k=1:i;
+        if k>q
+            g(k)=0;
+        else
+            if (i-k+1)>w
+                h(i-k+1)=0;
+            else
+             y(i)= y(i) + g(k)*h(i-k+1);
+            end
+        end
+    end
+end
+n=-1:z-2;
+disp(y,'The Convolution of the two sequences is =')
+clf();
+a=gca();
+figure(0);
+a.x_location="origin";
+plot2d3(n,y,2);
+plot(n,y,'r.');
+xtitle('convolution','n','y');