in the documentation for "by", please change the "See also" section to

\seealso{\code{\link{tapply}}, \code{\link{simplify2array}},
\code{\link{ave}}}

(simplify2array, by, and ave should probably also be mentioned in the "See
also" section of "apply".)

hope this helps.

/iaw
----
Ivo Welch (ivo.welch@gmail.com)

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