[R-pkg-devel] why can't we importFrom 'methods' ?

Martin Maechler m@echler @ending from @t@t@m@th@ethz@ch
Thu May 17 17:57:39 CEST 2018

>>>>> Brian G Peterson <brian at braverock.com>
>>>>>     on Thu, 17 May 2018 10:51:17 -0500 writes:

    > newer versions of R require importFrom for functions from
    > 'stats', 'graphics' and many other packages that used to
    > be assumed to be on the search path and thus available.

    > 'methods' continues to have seemingly different treatment.

    > If you try to use importFrom to import a single function
    > (in this case 'hasArg') from methods, you receive an ERROR
    > from R CMD check

    >     Namespace dependency not required : 'methods'

    > but without the importFrom, you see a number of NOTE's

    >     no visible global function definition for 'hasArg'

    > I don't want to import all of 'methods', as I only need
    > one function.

Many many good(*) packages import from methods, from R base, it
is "of course" only 'stats4';
from packages I maintain:  Matrix, Rmpfr, copula (at least)
then many hundreds of high quality bioconductor packages.

    > What am I doing wrong?

Did you add it to the DESCRIPTION to the 'Imports:' ?

    > Regards,

    > Brian

    > -- 
    > Brian G. Peterson http://braverock.com/brian/ Ph:
    > 773-459-4973 IM: bgpbraverock

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