[Rd] Dependency problem for "hasArg"

Mauricio Zambrano-Bigiarini mauricio.zambrano at jrc.ec.europa.eu
Tue Jul 3 09:36:43 CEST 2012

On 03/07/12 09:10, Martin Morgan wrote:
> On 07/03/2012 09:07 AM, Mauricio Zambrano-Bigiarini wrote:
>> On 02/07/12 22:51, Martin Morgan wrote:
>>> On 07/02/2012 06:23 PM, Charlie Friedemann wrote:
>>>> The error message you are getting makes it rather clear what the
>>>> problem is.
>>>> R is unable to find the function 'hasArg'. As the hasArg function is
>>>> part
>>>> of the package 'methods', a solution would be to put require(methods)
>>>> at the
>>>> beginning of your script.
>>> But I think the idea will be to import(methods) in HydroGOF, since the
>>> package requires these imports to function properly, and import'ing will
>>> mean that hasArg does not have to be found on the (user-controlled)
>>> search path.
>> Thank you very much for your help.
>> I have already tried import(methods) in the NAMESPACE of hydroGOF,
>> however, I got the following error message when doing R CMD check:
>> checking package dependencies ... ERROR
>> Namespace dependency not required: ‘methods’
>> So it seems that is not possible to force a package to import 'methods'.
> In your DESCRIPTION file, add
> Imports: methods
> Martin
Thank you very much Martin.

Now hydroGOF with import(methods) pass R CMD check without any problem.

All the best,


>> Regarding the Dirk's comment, could it be possible to revisit the
>> decision about loading 'methods' in in Rscript ?. BTW, I do not know who
>> is responsible for Rscript...
>> Thanks in advance,
>> Mauricio

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