Hi Nils,

I think you're missing the simplicity of pylab if you don't use the 'spy' or 'spy2' approach. Here is what I had to do. (I needed to install the suggested http://matplotlib.sourceforge.net/matplotlibrc, changing 'backend:TkAgg' and 'interactive:True')

[screenshot]

Nils Wagner wrote:
Thank you for your feedback.
Finally I have used Robert Cimrman's code to generate a matrix structure
plot (structure.png).
  

-- 
John Pye
Department of Mechanical and Manufacturing Engineering
University of New South Wales, Sydney, Australia
http://pye.dyndns.org/