[R] multiple variables pointing to single dataframe?

[Alex Bryant]

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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