How to draw an arrow with matplotlib and python

This is my OLD blog. I've copied this post over to my NEW blog at:

http://www.saltycrane.com/blog/2007/01/how-to-draw-arrow-with-matplotlib-and/

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Here is an example of how to draw an arrow with matplotlib. It should be
very easy, but I had to change the width setting so the arrow head would
not be too small. Further documentation is here:
http://matplotlib.sourceforge.net/matplotlib.pylab.html#-arrow

""" arrow_ex.py
"""
from pylab import *
figure()
axes()
arrow(.1,.1,.2,.2, width=0.01)
show()