stem plots outside axes area?

does any one familiar with this issue? I simply use stem to plot, but the data outside axes area are shown

Answer 1

[Hiro Yoshino]

Please show your code for me!

[Song Decn]

figure;
subplot(221);
subplot(222);
subplot(223);
Y = linspace(-2*pi,2*pi,50);
stem(Y)
xlim([20 50])
subplot(224);

sample codes above

it has some problem with subplot, i think