# Re: [R] How to get the name of the first argument in an assignment function?

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Thu 27 Jul 2006 - 23:38:15 EST

The complexity of the function should not matter.

Here is another example of this technique: http://tolstoy.newcastle.edu.au/R/help/04/06/1430.html

On 7/27/06, Heinz Tuechler <tuechler@gmx.at> wrote:
> At 06:10 27.07.2006 -0400, Gabor Grothendieck wrote:
> >If you are willing to write fu2[Var] <- 3 instead of fu2(Var) <- 3
> >then this workaround may suffice:
> >
> >fu2 <- structure(NA, class = "fu2")
> >"[<-.fu2" <- function(x, ..., value) { print(match.call()[[3]]); fu2 }
> >
> ># test
> >fu2[Var] <- 3 # prints "Var"
> >
> >
> Thank you, Gabor for your response. My example was very reduced, just to
> show the point, but in the way I would like to use it, probably your
> solution may be difficult to apply. Seems, I have to accept that I cannot
> solve it.
>
> Thanks again,
> Heinz
>
> >On 7/27/06, Heinz Tuechler <tuechler@gmx.at> wrote:
> >> Dear All!
> >>
> >> If I pass an object to an assignment function I cannot get it's name by
> >> deparse(substitute(argument)), but I get *tmp* and I found no way to get
> >> the original name, in the example below it should be "va1".
> >> Is there a way?
> >>
> >> Thanks,
> >>
> >> Heinz
> >>
> >> ## example
> >> 'fu1<-' <- function(var, value) {
> >> print(c(name.of.var=deparse(substitute(var))))}
> >> fu1(va1) <- 3
> >>
> >> name.of.var
> >> "*tmp*"
> >>
> >> ## desired result:
> >> ## name.of.var
> >> ## "va1"
> >>
> >>
> >>
> >> version
> >> _
> >> platform i386-pc-mingw32
> >> arch i386
> >> os mingw32
> >> system i386, mingw32
> >> status Patched
> >> major 2
> >> minor 3.1
> >> year 2006
> >> month 07
> >> day 23
> >> svn rev 38687
> >> language R
> >> version.string Version 2.3.1 Patched (2006-07-23 r38687)
> >>
> >> ______________________________________________
> >> R-help@stat.math.ethz.ch mailing list
> >> https://stat.ethz.ch/mailman/listinfo/r-help
> http://www.R-project.org/posting-guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >>
> >
> >
>
>

R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu Jul 27 23:54:32 2006

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