On Aug 22, 2013, at 15:33, Henrik Bengtsson <h...@biostat.ucsf.edu> wrote:
> On Thu, Aug 22, 2013 at 10:05 AM, R. Michael Weylandt > <michael.weyla...@gmail.com> <michael.weyla...@gmail.com> wrote: >> >> >> On Aug 22, 2013, at 9:09, Michael Friendly <frien...@yorku.ca> wrote: >> >>> In checking my vcdExtra package, the following NOTE newly appeared >>> (R-Forge, using R version 3.0.1 Patched (2013-08-20 r63635)) >>> >>> Package in Depends field not imported from: ‘gnm’ >>> These packages needs to imported from for the case when >>> this namespace is loaded but not attached. >>> >>> In the DESCRIPTION file, I have >>> >>> Depends: R (>= 2.10), vcd, gnm (>= 1.0.3) >>> >>> In NAMESPACE: >>> >>> # we are a vcd extension >>> import(vcd) >>> >>> I've read 1.1.1 of R-Exts, but it is not clear to me whether I should also >>> import gnm or change >>> the DESCRIPTION file to use >>> >>> Imports: vcd, gnm (>= 1.0.3) >>> >>> R-Exts says: The ‘Imports’ field lists packages whose namespaces are >>> imported from (as specified in the >>> NAMESPACE file) but which do not need to be attached, but how can I tell if >>> gnm needs to be attached? >> >> I think the current best practice is to use Imports unless gnm provides >> functions the end user needs in order to use your package. >> >> Practically, I think this usually comes down to asking whether gnm provides >> relevant generics -- if you provide methods only, the end user would only be >> able to call them directly (ick!) unless gnm is both loaded and attached >> (Depends) >> >> If gnm is tools for your code, but not the user to call directly, Imports is >> cleaner. >> >> Does that help? >> >> Michael >> >>> >>> Also, what is the difference between Imports: in DESCRIPTION and imports() >>> in NAMESPACE? >> >> One enables the other: Imports in DESCRIPTION allows for both imports() and >> importsFrom(). It could probably be automatic, but the DESC file is much >> older than the NAMESPACE file. > > I pretty sure you can also use import()/importFrom() in NAMESPACE for > packages listed under Depends in DESCRIPTION. > Agreed, but you couldn't auto-generate Depends from the namespace file. I suppose if (per my above) Depends was only used for generics... Not sure if the devtools world does anything like this, though it seems logical enough. Michael > /Henrik > >> >> >>> -Michael >>> >>> -- >>> Michael Friendly Email: friendly AT yorku DOT ca >>> Professor, Psychology Dept. & Chair, Quantitative Methods >>> York University Voice: 416 736-2100 x66249 Fax: 416 736-5814 >>> 4700 Keele Street Web: http://www.datavis.ca >>> Toronto, ONT M3J 1P3 CANADA >>> >>> ______________________________________________ >>> R-devel@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-devel >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
