Duncan Murdoch <murdoch.dun...@gmail.com> writes: > 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 was aware that my wording was not the best - your explanation makes
the whole process much clearer - thanks.
>
>>
>> I hope the example below makes the question clear:
>>
>> --8<---------------cut here---------------start------------->8---
>> tmp <- attach(what=NULL, name="org:variables")
>> tmp$test = 13
>> rm(tmp)
>> test
>> # > 13
>> test <- 24
>> test
>> # > 24
>> ls(all=TRUE)
>> # > character(0)
>
> I don't know why you would have seen character(0) here. You should
> have seen "test" in the list, because you created it a couple of lines
> earlier.
You are right. Wrong copy - paste. My fault.
>
>> #
>> # how can I access the variable test in the object org:variables in the
>> # search path?
>> #
>> rm(test)
>> test
>> # > 13
>> --8<---------------cut here---------------end--------------->8---
>>
>> Any suggestions?
>
> You can use assign, or get a reference to the environment using
> as.environment("org:variables"), and access it within that. For
> example,
>
> assign("test", 24, pos="org:variables")
>
> or
>
> e <- as.environment("org:variables")
> e$test <- 24
Perfect - that is what I was looking for.
Both will work perfectly in my case.
Thanks lot,
Rainer
>
> Duncan Murdoch
--
Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology,
UCT), Dipl. Phys. (Germany)
Centre of Excellence for Invasion Biology
Stellenbosch University
South Africa
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email: rai...@krugs.de
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