R-alpha: apply()
Thomas Lumley
Thomas Lumley <thomas@biostat.washington.edu>
Fri, 22 Aug 1997 09:30:08 -0700 (PDT)
On Fri, 22 Aug 1997, Kurt Hornik wrote:
> The following is identical in R and S, but still strange ...
>
> R> apply(matrix(1:20, nc = 4), 1, table)
> [,1] [,2] [,3] [,4] [,5]
> [1,] 1 1 1 1 1
> [2,] 1 1 1 1 1
> [3,] 1 1 1 1 1
> [4,] 1 1 1 1 1
> R> apply(matrix(rep(1, 20), nc = 4), 1, table)
> [1] 4 4 4 4 4
Yes it is. This is the sort of thing I meant when I complained about
drop=F being the default.
The third example should be documented in the man page, which only
describes what happens "If each call to FUN returns a vector of length n"
In fact the Blue Book help pages and the current S-PLUS help also
ignore this possibility.
Thomas Lumley
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