[earl]

Thanks a bunch for the help. It would be nice if this were documented somewhere besides reading the source code though :( And none of my googling turned up m2.data.

I'd actually guessed that it might be making columns full, but I'd expected to see a step-ladder up and down memory pattern as fectors were allocated, gc was triggered, vectors were allocated, etc. I didn't observe such a pattern; memory usage was almost constant.

Anyway, thanks again for your help -- I'd offer via email to buy you a beer if you're ever in SF, but no email, so...