Re: [R] Extract information from the names of a list within lapply

From: Jun Shen <jun.shen.ut_at_gmail.com>
Date: Fri, 15 Apr 2011 14:06:51 -0500

Thanks, Joshua and Henrique.

Henrique's solution is very interesting. Could you explain a bit more? What does this grammar mean?

match.call()[[2]][[3]]

Jun

On Fri, Apr 15, 2011 at 1:27 PM, Henrique Dallazuanna <wwwhsd_at_gmail.com>wrote:

> Try this:
>
> lapply(mtcars, function(.)names(mtcars)[match.call()[[2]][[3]]])
>
> On Fri, Apr 15, 2011 at 3:14 PM, Jun Shen <jun.shen.ut_at_gmail.com> wrote:
> > Dear list,
> >
> > I want to loop over a list through lapply and at the same time I want to
> > extract some information from the names of the list elements. lapply does
> > not seem to carry the names. Is there anyway to access the names of a
> list
> > within lapply? Thanks.
> >
> > Jun
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help_at_r-project.org mailing list
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> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>

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