On 01/09/2010 7:03 PM, Vadim Ogranovich wrote:
Dear R-users,
Is there a way to test whether a particular environment e is equal to
emtyenv(), or for that sake whether two environments e1 and e2 are equal?
I tried a couple of ways to compare environments, but neither seem to work:
e1 <- new.env()
e2 <- new.env()
e1 == e2
Error in e1 == e2 :
comparison (1) is possible only for atomic and list types
all.equal(e1, e2)
[1] TRUE
all.equal(e1, emptyenv())
[1] TRUE
My ultimate goal is to make a list of all variables in the lexical scope
(enclosure?) of a function FUN. So I thought I'd start with environment(FUN)
and apply parent.env() until I reach emptyenv(). But for this to work I need to
be able to detect that I reached emptyenv().
identical(e1, e2) should give the right answer, assuming you want e1 and
e2 to test as different.
Duncan Murdoch
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