End of week harumph

The paper still isn't done.. although I guess we're close now than we were (?). It's just dragging on forever! As far as my other work is concerned, I have a function that should give me a positive definite matrix, but doesn't. Why?! I don't know.
With 3 hours of teaching ahead of me this afternoon, I doubt I'll know the answer to that this week. Sigh...