On Fri, 4 Jul 2008, Ulrich Leopold wrote:

Dear list,

is there a way of updating the search path when using attach() for a data set.

I am overwriting a variable in a data frame. To update teh search path I do
the follwoing:

attach(dataset)
some data manipulation of dataset
detach(dataset)
attach(dataset) # to update the search path

Is there a way to avoid the numerous detach() and attach() commands?

Not if 'dataset' is that data frame (you didn't actually say). From the help page:

     The database is not actually attached.  Rather, a new environment
     is created on the search path and the elements of a list
     (including columns of a data frame) or objects in a save file or
     an environment are _copied_ into the new environment.  If you use
     '<<-' or 'assign' to assign to an attached database, you only
     alter the attached copy, not the original object.

So you can both change the data frame and assign the column to pos=2 to get the effect of what you appear to want.

Thanks in advance,
Ulrich Leopold



--
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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