Re: [Rd] by should use match.fun

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Sun 12 Jun 2005 - 19:37:23 GMT

On 6/12/05, Simon Urbanek <simon.urbanek@r-project.org> wrote:
> On Jun 12, 2005, at 3:21 PM, Gabor Grothendieck wrote:
>
> > On 6/12/05, Liaw, Andy <andy_liaw@merck.com> wrote:
> >
> >> I don't get the point. ?by says:
> >>
> >
> > The point is that all other functions of this sort including apply,
> > sapply,
> > tapply, lapply work like that so 'by' ought to as well.
> >
> > Here is the example (changed to use iris) where I noticed it.
> > Suppose we
> > want to create a list of rows:
> >
> > by(iris, row.names(iris), "(")
>
> Umm.. why don't you just use
>
> by(iris, row.names(iris), `(`)
>
> In general I consider passing functions as text unnecessary - the
> only use I could think of is constructing function names from strings/
> data and I'm not sure that is a good idea, either (it causes quite
> some performance issues) ... just my 2 pennies ...

That's a good idea and I will change my code accordingly although it does not change the fact that an inconsistency remains and should be corrected.



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https://stat.ethz.ch/mailman/listinfo/r-devel Received on Mon Jun 13 05:39:36 2005

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