cbind is not generic as claimed, omits labels where S has them (PR#239)

[Peter Dalgaard BSA]

Ross Ihaka <ihaka@stat.auckland.ac.nz> writes:

> I can see what the problem is - we don't have the generic dispatch
> mechanism in place.  I will add it.
> 
> I think that the special casing of data frames is needed because this
> appears to be the (undocumented) S behaviour.  A data frame anywhere in
> the argument list causes the result to be a data frame.

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

-- 
   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
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