[R] Specification of factors in tapply

[rijn@swi.psy.uva.nl]

> It looks a bit unsafe to rely on the storage order in x. I'd go for
> brute force and ignorance:

Thanks again for the useful hints. The problem is that the "safe" method
you suggested takes a long time to finish on a quite fast computer, and I
need to call this function a lot of times. So, I'll stick to the
unlist(tapply(...)) option for now. I'll keep the save version in the back
of my head for an interfacing C/R exercise. (A v.tapply function, or
something similar.)

Thanks,
  Hedderik.

-- 
http://swipc30.swi.psy.uva.nl/~rijn

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