[R] managing .RData

[fan@katan.cybercom.net]

Unlike in S-plus, the datasets for R are in a single file .RData. Consequently,
it becomes hard to clean the objects after it grew too big.
In particular, I wonder
  o how to locate the objects with big sizes (and then delete them) 
    among hundreds of objects (output of ls()). In Splus on UNIX, I use ls in
    the shell to work on this, since objects correspond to separate UNIX files.
    For R, this must be worked on differently.
  o how to add another database (data + functions) in the search path.
    In Splus, I use
    attach("directory/.Data")
    This way, I could keep the 
    It seems not work in R. 
    Error: attach only works for lists and data frames

    Creating a library will be one solution. Some data are not permanent.
    Are there some simple commands to expand the search path?

If you had similar experiences and have found a way, please let me know. 
Regards

Fan
  

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