Romain Francois wrote:
Hello,
I very much enjoy "with" and "subset" semantics for data frames and was
wondering if we could have something similar with split, basically by
evaluating the second argument "with" the data frame :
I seem to recall that this idea was considered and rejected when the
current split.data.frame was written (10 years ago!). The main reasons
were that
- it's not really THAT hard to evaluate a single splitting expression
using with() or eval()
- not all applications will have the splitting factor inside the df to
split ( split(df[-1], df[[1]]) for a simple case)
- if you need a computed splitting factor, there's a risk of inadvertent
variable capture. I.e., if you inside a function do
....
grp <- ...whatever...
spl <- split(x, grp)
....
and x has a variable called grp, what do you get?
--
O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalga...@biostat.ku.dk) FAX: (+45) 35327907
______________________________________________
R-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-devel
