[Matplotlib-users] How to write matrices in Sphinx using matplotlib extensions ?

[info <in...@ma...>]

Hi,
first of all, thanks for matplotlib!Then, the question. After reading this
 
http://matplotlib.sourceforge.net/sampledoc/extensions.html
 
I've tried to use something like: 
.. math::    \left| \begin{array}{cc} x_{11} & x_{12} \\ x_{21} & x_{22} \end{array} \right|but it doesn't work. 
Can you help me?Thanks,
 
Manuel