Re: [R] Removing objects and clearing memory

From: Rolf Turner <rolf.turner_at_xtra.co.nz>
Date: Wed, 13 Apr 2011 10:45:37 +1200

On 13/04/11 09:49, Denis Kazakiewicz wrote:
> On 13.04.2011 00:39, Jim Silverton wrote:

>> How do I remove all objects except one in R?
>>

> rm(list=ls()) #will remove ALL objects

But he wanted to remove all objects ***except one***!!! So what's the point of this answer?

I can't see any way except a rather round-about kludge to do what the OP wants.

Create a function:

rmabo <- function(x) {
# Remove all but one.

     fff <- tempfile()
     save(list=deparse(substitute(x)),file=fff)
     rm(list=ls(pos=1),pos=1)
     load(fff,envir=.GlobalEnv)
     unlink(fff)

}

Save this function (otherwise it will get removed when you remove all objects except one, and rmabo is not the one, and will be lost):

save(rmabo,file=".rmabo.rda")

Whenever you want to remove all objects except one, attach the data base in which you have saved "rmabo". (You only need to do the attaching once per session; if you like you could put the attach command in your .Rprofile.)

attach(".rmabo.rda")

Then to remove all objects except "melvin" execute rmabo(melvin). E.g.:

rm(list=ls)
ls()
character(0)
melvin <- clyde <- irving <- fred <- 42
ls()
[1] "clyde" "fred" "irving" "melvin"
rmabo(melvin)
ls()
[1] "melvin"

This seems to work. Anyone have any cleverer ideas to accomplish the stated objective?

     cheers,

         Rolf Turner



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