On Sat, 29 Nov 2008, Faheem Mitha wrote:
Hi,
If I want to import the contents of a R file into another one, I can do
source("foo.R")
However, this imports everything from foo.R, including all functions and
global variables. Is there a way of selectively importing individual
functions etc., in a similar fashion to Python's
from foo import bar
There are probably a lot of ways to skin this cat.
But you might want to explain why you want to do this in the first place.
It may turn out that the problem you wish to solve is better addressed by
placing your objects in a package that is attached far down the search
list.
A simple way to do what you say you want:
Use
source("foo.R", local=TRUE)
from within a function. Then either assign( ..., envir=.GlobalEnv )
selected objects or attach( list( ) ) them.
Another way is to use parse, as.character.srcref, and friends to avoid
evaluating each of the objects, then eval() selected expressions in the
desired environment.
HTH,
Chuck
? Thanks in advance. Please cc me on any reply.
Regards, Faheem.
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
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http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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