[R] Ranking within a classification variable.

[Rolf Turner]

In response to my question Andy Liaw wrote:

> Here's one way:

	<snip>

> > dat$rank <- with(dat, ave(x, f, FUN=rank))

	<snip>

> Don't know how this rates on the slick-quick-sexy scale...

Thanks Andy.  That's definitely a 10 on the slick-quick-sexy scale.
I (blush!) didn't know about ``ave()''.

			cheers,

				Rolf