[R] multiple variables pointing to single dataframe?

[Alex Bryant]

That's great, that will work perfectly..

Thanks All!

-Alex

-----Original Message-----
From: Gabor Grothendieck [mailto:ggrothendieck at gmail.com] 
Sent: Monday, April 19, 2010 10:34 AM
To: Alex Bryant
Cc: r-help at r-project.org
Subject: Re: [R] multiple variables pointing to single dataframe?

If you only need to retrieve x by referring to x2 and you don`t have
to modify x via x2 then this works:

> x <- Orange
> makeActiveBinding("x2", function() x, .GlobalEnv)
> x$age <- 50
> head(x2)
  Tree age circumference
1    1  50            30
2    1  50            58
3    1  50            87
4    1  50           115
5    1  50           120
6    1  50           142


On Mon, Apr 19, 2010 at 10:15 AM, Alex Bryant <abryant at i-review.com> wrote:
> Hi, for example:
>
>> x <- Orange
>> x2 <- x
>> x[1,]$age <- 50
>> x2[1,]
>  Tree age circumference
> 1    1 118            30
>
> I would like a way for x2 to also reference the modified x data frame without having to reassign x2<x each time x is modified.
>
> Thanks,
> Alex
>
> -----Original Message-----
> From: Petr PIKAL [mailto:petr.pikal at precheza.cz]
> Sent: Monday, April 19, 2010 3:18 AM
> To: Alex Bryant
> Cc: r-help at r-project.org
> Subject: Odp: [R] multiple variables pointing to single dataframe?
>
> Hi
>
> r-help-bounces at r-project.org napsal dne 16.04.2010 16:15:40:
>
>> Hi,  I have a need to have 2 variables point to the same dataframe (d1),
>  I
>
> What does it mean to point to data frame? Seems to me that it is something
> from C+.
>
> You can reference data frame by $ or by square brackets with as many
> variables as you want.
>
> see
>
> ?"["
>
> regards
> Petr
>
>
>> don't want to simply copy the dataframe ( d2<-d1 ) as my understanding
> is that
>> this will create a second dataframe.  Any suggestions on best practice
> here?
>>
>> Thank You,
>>
>> //************************
>> // Alex Bryant
>> // Software Developer
>> // Integrated Clinical Systems, Inc.
>> // 908-996-7208
>>
>>
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