What about using NULL?
> x<-runif(12)
> y<-runif(12)
> z<-runif(12)
> mydf<-data.frame(cbind(x,y,z))
> names(mydf)
[1] "x" "y" "z"
> mydf$x<-NULL
> names(mydf)
[1] "y" "z"
--- On Tue, 9/29/09, Rolf Turner <r.tur...@auckland.ac.nz> wrote:
> From: Rolf Turner <r.tur...@auckland.ac.nz>
> Subject: Re: [R] Deleting a column in a dataframe by name
> To: "Duncan Murdoch" <murd...@stats.uwo.ca>
> Cc: "Dennis Fisher" <fis...@plessthan.com>, "r-h...@stat.math.ethz.ch"
> <r-h...@stat.math.ethz.ch>
> Date: Tuesday, September 29, 2009, 4:36 PM
>
> On 30/09/2009, at 10:25 AM, Duncan Murdoch wrote:
>
> > On 29/09/2009 4:54 PM, Rolf Turner wrote:
> >> On 30/09/2009, at 9:32 AM, milton ruser wrote:
> >>
> >>> x=runif(12)
> >>> y=runif(12)
> >>> w=runif(12)
> >>>
> >>> mydf<-data.frame(cbind(x,y,w))
> >>> head(mydf)
> >>>
> >>> mydf<-subset(mydf, select=c(-x,-w))
> >>> head(mydf)
> >>>
> >>>
> >> But this doesn't work if NAME1
> and NAME2 are ***names***,
> >> as the terminology would
> apply. And that is precisely the
> >> situation in which one would
> wish to apply this sort of
> >> technique.
> >
> > I'm not completely sure what you're getting at here,
> but I think
> > milton
> > is right in this example. (The original one was
> missing the "c".)
>
> milton is right if you explicitly type
> in the names of the
> columns to be deleted. But it
> doesn't work if you store
> the names of the columns as character
> strings. That's what
> you would have to do when writing code
> to handle complex
> situations where you didn't know that
> column names in advance.
>
> And if you're not writing code, well why
> not just do something
> simple like mydf[,2] ???
> >
> > subset() is weird, it does very strange stuff in the
> select argument.
>
>
> Truer words were never spoken/written.
>
> cheers,
>
>
> Rolf
>
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