Two questions

1) (Simple) Is there a defined behavior for matplotlib when
it attempts to graph data containing NaN values? (OK, I admit--
it's really, really late, and I have tried it to see what happens.
But even that wouldn't tell me if that was the _defined_
behavior :-))

2) I expect to be using matplotlib quite a bit in the future,
and will likely be using it in a more object-oriented mode
(i.e. not through the matlab-style interface), since that's
what I like better. I haven't seen any "howto" documents
for using the OO API. Do any exist? I'd be happy to make
notes and write a tutorial as I learn, but don't want to
duplicate work that already exists.