On Mon, Mar 3, 2008 at 4:37 PM, Rolf Turner <[EMAIL PROTECTED]> wrote:
>
> On 4/03/2008, at 10:38 AM, Ericka Lundström wrote:
>
> > On 03/03/2008, at 22.20, [EMAIL PROTECTED] 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.
Hadley
--
http://had.co.nz/
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