On Sep 9, 2009, at 9:40 , Henrique Dallazuanna wrote:
If I understand your question, you can get the environment with
sys.frame:
f <- function(code){
print(sys.frame())
^-- this will always return R_GlobalEnv (see ?sys.frame - which = 0 by
default) regardless of the function and promise.
Also the question was about the environment of the promise, not the
function. Technically a promise can be evaluated anywhere since it
ignores the evaluation environment and will use its creation
environment which is what Hadley was trying to get at (and as Duncan
was saying it's not something that is or should be available at R
level as it's an internal implementation detail).
Cheers,
Simon
force(code)
}
f({
a <- 1
b <- 2
})
On Wed, Sep 9, 2009 at 10:30 AM, Hadley Wickham <[email protected]>
wrote:
Hi all,
Is it possible to determine the environment in which a promise will
be
evaluated? e.g.
f <- function(code) { force(code) }
f({
a <- 1
b <- 2
})
Is there any way to tell from within f that a and b will be created
in
the global environment?
Thanks,
Hadley
--
http://had.co.nz/
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Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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