On Fri, 6 Aug 1999 ihaka@stat.auckland.ac.nz wrote:
On Fri, Aug 06, 1999 at 12:08:05AM +0200, Peter Dalgaard BSA wrote:
Ross Ihaka <ihaka@stat.auckland.ac.nz> writes: I played around with this earlier today. There's nothing special about dataframes, S does the same with any classed object. I.e. class(b)<-"my" cbind.my<-function(...)match.call() cbind(a,b) will dispatch cbind.my
I played some more. I think data frames are special somehow. S> x <- factor(1:10) S> y <- data.frame(1:10)
> class(x)
[1] "factor" S> class(y) [1] "data.frame" S> class(cbind(x,y)) [1] "data.frame" S> class(cbind(y,x)) [1] "data.frame" They seem to overpower other class arguments too.
Once again, there is a difference between what S documents it does and what
it actually does. The on-line help says:
Returns a matrix that is pieced together from several
vectors and/or matrices. The functions cbind and rbind are
generic (relative to their first argument). In particular,
there are cbind and rbind methods for classes in the
Matrix library.
I would settle for that. I think what in part is going is that the
one method, in particular the default method, may use another method.
Brian D. Ripley, ripley@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272860 (secr) Oxford OX1 3TG, UK Fax: +44 1865 272595 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._