Figure size with subplots

[karl]

Hi all,

I have a simple question about subplots.
If I write:

x=linspace(0,50,4);
subplot(1,2,1);
plot(x,x.^2);
subplot(1,2,2);
plot(x,x.^4);

I get two very tall and narrow plots in a quadratic window.
How to change the size of the window that I have two plots of quadratic size
in a rectangular window whose height is half the width?

Thanks!