accuracy issues with numpy arrays?

[Robert Kern]

You will want to ask numpy questions on the numpy mailing list:

   http://www.scipy.org/Mailing_Lists

I need a little more time to mull on your problem to give you an actual answer, 
but I hope I can do that over there instead of here.

-- 
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
  that is made terrible by our own mad attempt to interpret it as though it had
  an underlying truth."
   -- Umberto Eco