Re: [R] identical function names from 2 packages

From: Janko Thyson <janko.thyson.rstuff_at_googlemail.com>
Date: Fri, 20 May 2011 11:32:12 +0200

Thanks for the info.

I think I've tried that a while ago, but IIRCC, the problem was always that R won't let me create on object that would pass as a full grown NAMESPACE object.

 > foo <- function(x) print(x)
 > assignInNamespace(x="foo", value=foo, ns="testNS") Fehler in loadNamespace(name) : there is no package called 'testNS'

I've looked into this briefly:
?asNamespace
?attachNamespace

But there are no examples, so I don't really know how to use them ;-)

Regards,
Janko

On 20.05.2011 10:45, Barry Rowlingson wrote:
> On Fri, May 20, 2011 at 9:16 AM, Janko Thyson
> <janko.thyson.rstuff_at_googlemail.com> wrote:
>
>> Yet, IMHO there will be more and more problems regarding this in the
>> future as the number of contributed packages keeps growing. I personally
>> would not mind at all to get used to typing 'thePackage::foo()' *all*
>> the time, or at least have this as an option. In principal, this is no
>> big deal once you actually *have* a true package with a namespace at
>> hand. But what about the process of creating a package? AFAU, there is
>> no way of "simulating/emulating" a namespace (which I understand is some
>> special form of environment?) in order to be able to use '::' when
>> creating/debugging functions that call other functions of the unfinished
>> package. If anyone has some ideas on that one, I would appreciate to hear.
> there's some stuff in utils that might do it for you:
>
> Description:
>
> Utility functions to access and replace the non-exported functions
> in a name space, for use in developing packages with name spaces.
>
> Usage:
>
> getFromNamespace(x, ns, pos = -1, envir = as.environment(pos))
>
> assignInNamespace(x, value, ns, pos = -1,
> envir = as.environment(pos))
>
> fixInNamespace(x, ns, pos = -1, envir = as.environment(pos), ...)
>
>
> See ?assignInNamespace for the full info.
>
> Personally, I like the python way of doing things like this, and
> dealing with name clashes. You can do:
>
> import foo
>
> and then you do foo.bar(), foo.baz()
>
> or
>
> from foo import bar
>
> then you can just do bar(). There's also:
>
> from foo import *
>
> which lets you do bar(), baz(), but is frowned upon a bit because of
> possible name collisions. Or if you want to use functions with the
> same name from two packages you can do:
>
> from foo import bar as bar1
> from baz import bar as bar2
>
> Then you can do bar1() and bar2()
>
> Of course if you want to change anything in the bar package then
> similar hackery to the 'assignInNamespace' of R is necessary unless
> you want to rebuild the python package. Often called "Monkey
> patching", I think, although this possibly only refers to mucking with
> class objects and methods.
>
> Barry
>

-- 
------------------------------------------------------------------------

*Janko Thyson*
janko.thyson_at_googlemail.com <mailto:janko.thyson_at_googlemail.com>

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