Re: [Rd] Dependency problem for "hasArg"

From: Mauricio Zambrano-Bigiarini <>
Date: Tue, 03 Jul 2012 09:07:01 +0200

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'.

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,


Water Resources Unit
Institute for Environment and Sustainability (IES)
Joint Research Centre (JRC), European Commission
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> Martin
>> For whatever reason, loading R via Rscript does not load the base package
>> "methods" whereas loading the R console does. I'm not entirely sure
>> why this
>> is the case, and I'm sure someone who knows more about the differences
>> between the two could chime in here.
>> --
>> View this message in context:
>> Sent from the R devel mailing list archive at
>> ______________________________________________
>> mailing list
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Received on Tue 03 Jul 2012 - 07:10:01 GMT

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