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+//example 2.3a pg.no.14
+clear;clc;close;
+n=-2:2;
+x1=[4 -2 4 -6 0];
+x2=0.5*x1//x[n]
+x3=0.5*[x1(length(x1):-1:1)];//x[-n]
+xe=(x2+x3);//even part
+xo=(x2-x3);//odd part
+a=gca();
+a.thickness=2;
+a.x_location="middle";
+a.y_location="middle";
+plot2d3('gnn',n,xe,rect=[-4 -6 4 6])
+xtitle('graphical representation of even part of x[n]','n','x[n]')
+xset('window',1)
+b=gca();
+b.thickness=2;
+b.y_location="middle";
+b.x_location="middle";
+plot2d3('gnn',n,xo,rect=[-2 -4 2 4])
+xtitle('graphical representation of odd part of x[n]','n','x[n]')