From ihaka@stat.auckland.ac.nz  Fri Aug  6 03:55:34 1999
From: ihaka@stat.auckland.ac.nz (Ross Ihaka)
Date: Fri, 6 Aug 1999 14:55:34 +1200
Subject: cbind is not generic as claimed, omits labels where S has them (PR#239)
In-Reply-To: <x2lnbp7uey.fsf@blueberry.kubism.ku.dk>; from Peter Dalgaard BSA on Fri, Aug 06, 1999 at 12:08:05AM +0200
References: <199908051128.NAA28801@pubhealth.ku.dk> <19990806095312.A15303@stat1.stat.auckland.ac.nz> <x2lnbp7uey.fsf@blueberry.kubism.ku.dk>
Message-ID: <19990806145534.A3584@stat1.stat.auckland.ac.nz>

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.

	Ross

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