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List:       r-devel
Subject:    [Rd] SOLVED: creating namespaces outside packages
From:       Rainer M Krug <Rainer () krugs ! de>
Date:       2014-03-28 12:42:29
Message-ID: m2k3bewl3e.fsf_-_ () krugs ! de
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Duncan Murdoch <murdoch.duncan@gmail.com> writes:

> On 28/03/2014, 7:01 AM, Rainer M Krug wrote:
>> Hi
>>
>> I would like to use namespaces outside packages, but I could not find
>> any references on how to do it (only a thread [1] which says "use a
>> package"). Using a package is not possible in my case, as I am passing
>> variables from org-mode / emacs to R and would like to avoid name
>> clashes. This is a dynamic process, and each time the code is evaluated,
>> the variable can be different.
>>
>> I am putting them at the moment into an environment which is locked, but
>> I would like to avoid name clashes, so the idea of using environments.
>>
>> So: is there a way to create a namespace and populate it as I can do
>> with an environment?
>
> I don't know what you think is the difference between a namespace and
> an environment.  I would say a namespace is one of the environments
> associated with a package, i.e. it's just an environment in a
> particular context.
>
> So depending on what you are trying to accomplish, it may be fine to
> just set up an environment.  Why do you think that won't work?

An environment is what I use at the moment, but there is one aspect I
was not happy with: accessing the original value in the environment when
it is overwritten in a higher environment in the search path. But then I
discovered then notation of using $:

,----
| env <- new.env()
| assign("value", 99, env)
| attach(env)
| value <- FALSE
| value
| env$value
`----

So I can access the original value. I only thought initially about
the :: (or is it :::) to access the objects in a namespace, which do not
work for an environment.

So: Different solution and works perfectly.

Thanks,

Rainer




>
> Duncan Murdoch
>

-- 
Rainer M. Krug
email: Rainer<at>krugs<dot>de
PGP: 0x0F52F982

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