On 09/05/2014, 6:54 AM, Rainer M Krug wrote:
How can I access an object in an attached but deleted environment, when
the object also exists in the .GolbalEnv?
Attaching a variable to the search list generally makes a copy of it, so
it can't be "attached but deleted". However, "making a copy" of an
environment just copies the reference to it, so your environment still
exists on the search list, it just doesn't have a name in the global
environment.
I hope the example below makes the question clear:
--8<---------------cut here---------------start------------->8---
tmp <- attach(what=NULL, name="org:variables")
tmp$test = 13
rm(tmp)
test
# > 13
test <- 24
test
# > 24
ls(all=TRUE)
# > character(0)
I don't know why you would have seen character(0) here. You should have
seen "test" in the list, because you created it a couple of lines earlier.
#
# how can I access the variable test in the object org:variables in the
# search path?
#
rm(test)
test
# > 13
--8<---------------cut here---------------end--------------->8---
Any suggestions?
You can use assign, or get a reference to the environment using
as.environment("org:variables"), and access it within that. For example,
assign("test", 24, pos="org:variables")
or
e <- as.environment("org:variables")
e$test <- 24
Duncan Murdoch
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