plot_ellipse

It is common to find routines to plot ellipses without the ellipse phase angle parameter.
Phase angle provides important information in many applications...

This function also allows ellipse to be drawn at different z levels.

Three ways to show ellipse phase is shown in the screenshot:

plot_ellipse(2,1,45,20);
axis equal
hold on
plot_ellipse(2,1,45,20,[0 -2],'r',2);
plot_ellipse(2,1,45,20,[0 -4],'k',3);