[R] using tapply with a matrix?

Nurnberg-LaZerte mail at fwr.on.ca
Tue Mar 25 02:38:55 CET 2003

** 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.


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