Attaching at position 1 does not work in R, as you have found. That is in
?attach, and in the FAQ.
As the FAQ says, using save()d objects (read-only) can do quite a lot of
this. You could also save the workspace, clear it, and load another saved
image ... but it is probably easier to restart R.
On Tue, 20 Jan 2004 [EMAIL PROTECTED] wrote:
> Hello R-users,
>
> is it possible to navigate from one workspace to the other from within an R
> session or does one has to close R and restart it from the directory where
> resides the desired workspace?
>
> For example from Splus I have this little function, see at the end, which I
> used all the time to navigate between valid Splus directories. I find this
> particularly usefull when I develop new functions. Most projects I work on
> are large to extremely large, developing a function that takes a data.frame
> as input and manipulates it is very time consuming if the input data.frame
> is huge hence I have a valid Splus directory holding a few small
> data.frames, I move to it while developing the function and when I am happy
> with the function I move this function to my personnal library, always
> attached at position 2, then move back to the the current project's valid
> Splus directory.
>
> I tried a similar approach in R, from the command line --not using a
> function yet, and I was a bit surprised by the result. The objects already
> in the workspace, as called in R, stayed there and the objects from the
> workspace I wanted to attach were added to the current workspace and the
> workspace I was hoping to attach at pos 1 was attach at pos 2 with
> seemingly nothing in it?
>
> > attach("/home/jeg002/splus/GlmExamples/.RData", pos = 1)
> > search()
> [1] ".GlobalEnv"
> [2] "file:/home/jeg002/splus/GlmExamples/.RData"
> [3] "package:methods"
> ...
>
> > objects(pos = 2)
> character(0)
>
> The little function, mentioned above, and used in Splus.
>
> "chdir" <-
> function(datadir, default.path = '/actuaria/jeg002/')
> {
> # Author : Gerald Jean
> # Date : May 1999
> # Purpose : "newdir" will be attached at position 1, and the S directory,
> # currently at position 1 will be detached.
> # Arguments:
> # datadir : the directory to attach.
> # default.path : the drive on which resides the directory to attach.
> #------------------------------------------------------------------------
> data.dir.to.detach <- search()[1]
> to.attach <- paste(default.path, datadir, "/.Data", sep = "")
> attach(to.attach, pos = 1)
> detach(what = data.dir.to.detach)
> search()
> }
>
> Thanks for your insights,
>
> G�rald Jean
> Analyste-conseil (statistiques), Actuariat
> t�lephone : (418) 835-4900 poste (7639)
> t�lecopieur : (418) 835-6657
> courrier �lectronique: [EMAIL PROTECTED]
>
> "In God we trust all others must bring data" W. Edwards Deming
>
> ______________________________________________
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> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>
>
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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