[R] using tapply with a matrix?

[Thomas Lumley]

On Mon, 24 Mar 2003, Nurnberg-LaZerte wrote:

> ** Reply to message from Thomas Lumley <tlumley at u.washington.edu> on Mon, 24 Mar 2003 14:30:44 -0800 (PST)
>
> >Use by()
>
> That's what I need.
>
> Somebody should put a link to by() in the tapply() section of the html docs.
>

Somebody just did.

	-thomas