data.frame(...) not constructing "1:n" row.names [diff. S <--> R]
Martin Maechler <maechler@stat.math.ethz.ch> writes:
[I think Doug Bates has already alluded to this, somewhere..] In R, data.frame( ... ) does not construct row.names whereas in S, it does:
...
R core: Is there a good reason for this?
No.
Well (as a member of R-core, I give my answer): Memory efficiency can be a good reason, actually... together with ``cleanness'' : ``1:n'' are the IMPLICIT DEFAULT row.names We could stay at the current way `internally', but make sure that all functions working on data.frames `d.f' automatically work as if row.names(d.f) *was indeed* == paste(1:nrow(d.f)
Ugh. Please, let's avoid implicit stuff. All the special-casing involved all over the place would soon outweigh the saved storage of a character vector. We'll get nothing but trouble from it. Just add the rownames.
O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._