Re: [R] renaming objects

From: Rolf Turner <r.turner_at_auckland.ac.nz>
Date: Tue, 04 Mar 2008 13:36:37 +1300

On 4/03/2008, at 11:48 AM, hadley wickham wrote:

> On Mon, Mar 3, 2008 at 4:37 PM, Rolf Turner
> <r.turner_at_auckland.ac.nz> wrote:

>>
>>  On 4/03/2008, at 10:38 AM, Ericka Lundström wrote:
>>
>>> On 03/03/2008, at 22.20, Giles.Crane_at_doh.state.nj.us wrote:
>>>> Is there a way to rename R objects?
>>>> I am looking for a way to rename objects
>>>> without making new objects.
>>>>
>>>> #For example:
>>>> x = c(1:40)
>>>> # I wish to use a function to rename x, already created, to y,
>>>> perhaps by
>>>> obj.rename(x,y)
>>>> # or
>>>> obj.rename("x","y")
>>> y <- x # changes x to y with same values.
>>
>>         That makes a new object --- which is precisely what the  
>> enquirer
>>         wanted ***NOT*** to do.
>

> It doesn't though!
>
>> gc()

> used (Mb) gc trigger (Mb) max used (Mb)
> Ncells 133095 3.6 350000 9.4 350000 9.4
> Vcells 87049 0.7 786432 6.0 478831 3.7
>> a <- runif(1e7) >> gc()
> used (Mb) gc trigger (Mb) max used (Mb)
> Ncells 133112 3.6 350000 9.4 350000 9.4
> Vcells 10087364 77.0 11458389 87.5 10087374 77.0
>> b <- a
>> gc()

> used (Mb) gc trigger (Mb) max used (Mb)
> Ncells 133117 3.6 350000 9.4 350000 9.4
> Vcells 10087365 77.0 12111308 92.5 10087476 77.0
>
> R will only create a copy if either of a or b is modified.

Well RMIHATMTTL!!! R is even cleverer than I thought!!!

                cheers,

                        Rolf

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