strange error in points_to_pixel

unsupported operand type(s) for /: 'array' and 'float'

This is a known bug with older versions of Numeric (eg 22.0) combined
with "from __future__ import division". It also affects current
versions of numarray. If you upgrade to the latest Numeric it will go
away. I try and code around it; in this case I forgot. I'll add the
parens.

    > PS: the mathtext-option was a very pleasant surprise to me
    > (hadn't seen any discussion on it on the mailing list).

Glad to hear it - there was some discussion on the matplotlib-devel
list. I'm sure you'll encounter strangeness and some parse errors
since it is not widely tested, so please alert me when you do (check
the KNOWN ISSUES section of
http://matplotlib.sourceforge.net/matplotlib.mathtext.html).

JDH