initial commit / add all books

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+//EXAMPLE 2.28,graphical representation of convolution of x & h.
+clear;
+clc;
+x=[-2 0 1 -1 3];
+disp(x,'x');
+h=[1 2 0 -1];
+disp(h,'h');
+n=0:7;
+y=convol(x,h);
+disp(y,'convolution = ');
+clf();
+figure(0);
+a=gca();
+a.x_location="origin";
+a.y_location="origin";
+plot2d3(n,y)
+plot(n,y,'r.')
+xtitle('convolution','n','Y');
+a.children.children.thickness=2;
+a.children.children.foreground=2;