On 11/08/2008, at 9:57 PM, carol white wrote:
Thanks for your replies.
So there is no way to add one or more objects to the existing
objects stored in .RData?
Not really. There is no ``append=TRUE'' argument for save().
There is a workaround, of course. There [almost] always is in R:
attach(".RData",warn.conflicts=FALSE)
assign("clyde",clyde,pos=2)
savepos(2)
detach(2)
where ``clyde'' is the object you are trying to ``save selectively''.
***At this point*** the file .RData will contain the objects that
were in it
when you started your R session *and* ``clyde''.
However, it could easily get mucked up. In particular, if you were
to answer
``y'' to the question ``Save workspace image?'' when you quit,
then .RData
will get overwritten, and will then contain whatever objects were in
your
global environment at the time you quit.
Hence I would ***STRONGLY ADVISE YOU NOT TO PROCEED IN THIS MANNER***.
You are trying to use .RData in a way in which it was not intended
to be used,
and consequently tying yourself in knots.
If you want to save objects selectively, save them in a different
file from .Rdata,
and then load or append (or dget()) that file, as I suggested in my
previous email.
Use the facilities of R in the way that they were intended to be
used, rather than
trying to force your own inappropriate paradigm upon R. You'll find
it more efficient
to do things R's way rather than trying to force R to do things your
way. R gets
it right. [Almost] always!
cheers,
Rolf Turner
P. S. ``Almost always'' == ``except on a set of measure/probability
zero''. :-)
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