[R] How to get the namespace of a function?

[Duncan Murdoch]

On 2/2/2006 10:56 AM, Fernando Saldanha wrote:
> I declared the environment of the function myfun to be NULL as follows:
> 
> environment(myfun) <- NULL

Since version 2.1.0, it's been recommended that you use

environment(myfun) <- baseenv()

and since 2.2.0, you'll get a warning when using NULL (and you'll get an 
error in 2.3.0).  But why would you want to do that?  What are you 
trying to achieve?

Duncan Murdoch


> 
> Later on I called that myfun and got an error message because the
> function index() in the zoo package was called inside myfun and was
> not visible:
> 
> Error in myfun(args) : couldn't find function "index"
> 
> I tried to use zoo::index() instead of index(), but that did not work.
> In fact, zoo::index does not work even in the command line:
> 
>> z<-ts(1:5)
>> z
> Time Series:
> Start = 1
> End = 5
> Frequency = 1
> [1] 1 2 3 4 5
>> index(z)
> [1] 1 2 3 4 5
>> zoo::index(z)
> Error in loadNamespace(name) : package 'zoo' does not have a name space
> 
> How can I qualify index() so that it is visible inside the body of myfun?
> 
> Thanks for any suggestions,
> 
> FS
> 
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