See all x1,x2,x3 are three different 2d variables, how can you mix all these, how do you distinguish eash other?
You can plot them in three different graphs-
x1=rand(5,10);
x2=rand(5,10);
x3=rand(5,10);
subplot(131),bar3(x1);
subplot(132);bar3(x2),
subplot(133);bar3(x3);
