% axes('Position', [x y u v])
The bottom left corner of the axes is positioned at (x,y). The bottom left of your figure is the (0,0).
(u,v) are the width and height of your axes. Width and height are normalized quantities, therefore a value of 1 indicates the whole length of your figure
figure(1)
axes('Position',[.32 .22 .25 .15])
figure(2)
axes('Position',[.72 .22 .25 .15])
title('Changing X')
figure(3)
axes('Position',[.32 .72 .25 .15])
title('Changing Y')
figure(4)
axes('Position',[.32 .42 .55 .55])
title('Changing size')
