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

From: Heinz Tuechler <tuechler_at_gmx.at>
Date: Thu 27 Jul 2006 - 23:29:58 EST

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
>> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>



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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 23:53:26 2006

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