>>>>> "CG" == Christophe Genolini <[EMAIL PROTECTED]>
>>>>> on Tue, 22 Jul 2008 19:04:37 +0200 writes:
CG> Prof Brian Ripley <[EMAIL PROTECTED]> a écrit :
>> On Tue, 22 Jul 2008, [EMAIL PROTECTED] wrote:
>>
>>> Hi the list (well, half of the list, only the one who
>>> are not on holidays...)
>>>
>>> I am trying to make an S4 package. When I run it on a
>>> console, everything seems ok. When I run R CMD check, I
>>> got an error --- 8<
>>> ----------------------
>>> Error in setMethod("plot", "ClassX", function(x, y) { :
>>> no existing definition for function "plot" --- 8<
>>> ----------------------
>>>
>>> If I add
>>> setGeneric("plot",function(x,y,...){standardGeneric("plot")})
>>> in my code, then everything is OK.
>>>
>>> This is a surprise for me since I taught that we do not
>>> need to redefine as generic the function that are
>>> already generic, like "plot". Am I wrong ?
>>
>> Yes. And do read the error message. It says
>>
>> no existing definition for function "plot"
>>
>> so this is not if the function is S3 or S4 generic, but
>> that no such function is visible.
>>
>> Looks like you forgot to declare a dependence on (or
>> import) package graphics.
CG> I would have forgot if I knew that I have to declare
CG> such a dependence... Do we have to declare all the
CG> depence to all the package ? To base ? To stats ?
not to base, but to all other packages (since R can be loaded
without any packages but base).
CG> I thaught that the package that are include in R when we
CG> start it had not to be include.
You thought wrongly, and all our documentation mentions that you
need to use 'Depends:' correctly (and 'Imports(..)' in
NAMESPACE if you make use of one).
{and please strongly note the correct spelling of "thought" !}
Martin
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
