On 14.09.2010 20:50, Seb wrote:
On Tue, 14 Sep 2010 12:02:04 +0200,
Uwe Ligges<lig...@statistik.tu-dortmund.de> wrote:
It returns a list with athe class attribut set to "by", just use: x<-
by(.....) unclass(x)
Thanks Uwe, however, that still returns an array when using the
data.frame method for by():
R> class(unclass(with(warpbreaks, by(warpbreaks[, 1:2], tension, summary))))
[1] "array"
It seems as if the only way to really ensure a list:
R> class(lapply(unclass(with(warpbreaks, by(warpbreaks[, 1:2], tension,
summary))), function(x) x))
[1] "list"
but it seems like a waste to call another function just to do this.
Then you could still do
x <- by(.....)
attributes(x) <- NULL
Uwe
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