[R-pkg-devel] Calls not declared

[Elias Carvalho]

Thank you all !
I used import and works perfectly.

Em seg, 11 de mar de 2019 às 16:18, Duncan Murdoch <murdoch.duncan using gmail.com>
escreveu:

> On 11/03/2019 2:12 p.m., Jeff Newmiller wrote:
> > Ah, so as long as you don't need to call a normal function to make use
> of the returned object you don't need Depends. But in this example, the
> user would then need to call library(ggplot2) in order to, say, change an
> axis title.
>
> I think the current philosophy is that if a user wants to be able to use
> ggplot2 functions, the user should ask for them, they shouldn't be
> automagically added to the search list.  If a user wants to change the
> axis title and doesn't want to have ggplot2 on their search list, that
> is definitely possible:
>
> ggplot2::qplot(1:10, 1:10) + ggplot2::xlab("new x label")
>
> Duncan Murdoch
>
>
> > A bit more subtle than I thought.
> >
> > On March 11, 2019 10:07:12 AM PDT, Duncan Murdoch <
> murdoch.duncan using gmail.com> wrote:
> >> On 11/03/2019 11:32 a.m., Jeff Newmiller wrote:
> >>> I did not see any mention of the distinction between Depends and
> >> Imports in the DESCRIPTION file... which is always a risk when
> >> duplicating existing documentation in an email. Imports is preferred
> >> because the user does not have to put definitions only needed inside
> >> your package into their public search path (easier to make
> >> under-the-hood changes to the package implementation), but Depends is
> >> better when they cannot make use of your package without those
> >> definitions (e.g. you return a ggplot object from one of your
> >> functions).
> >>>
> >>
> >> You don't need Depends to be able to handle ggplot2 objects. You'll get
> >>
> >> the methods when the package is loaded, so they'll print fine without
> >> having ggplot2 on the search list.
> >>
> >> There are very few cases nowadays where it makes sense to use Depends.
> >>
> >> Duncan Murdoch
> >>
> >>> So do keep reading the documentation... email is just a kickstart.
> >>>
> >>> On March 11, 2019 8:19:33 AM PDT, Duncan Murdoch
> >> <murdoch.duncan using gmail.com> wrote:
> >>>> On 11/03/2019 9:53 a.m., Elias Carvalho wrote:
> >>>>> I am developing my first package and found these errors when
> >> checking
> >>>> it.
> >>>>>
> >>>>> Any help?
> >>>>>
> >>>>>
> >>>>> * checking dependencies in R code ... WARNING
> >>>>> 'library' or 'require' calls not declared from:
> >>>>>      ‘qgraph’ ‘semPlot’ ‘sna’ ‘xlsx’
> >>>>
> >>>> Without seeing your package I might be wrong, but I believe this
> >> says
> >>>> that you have something like
> >>>>
> >>>> library(qgraph)
> >>>>
> >>>> somewhere in your R code, without listing
> >>>>
> >>>> Depends: qgraph
> >>>>
> >>>> in your DESCRIPTION file.
> >>>>
> >>>> HOWEVER, fixing this warning will lead to a different one, because
> >>>> that's not the recommended way to do things now.  There are two
> >>>> possibilities:
> >>>>
> >>>> 1.  Your package is useless without the dependency.
> >>>>
> >>>> In this case, you should put
> >>>>
> >>>> Imports:  qgraph, ...
> >>>>
> >>>> in the DESCRIPTION file (where ... lists the other packages with the
> >>>> same status), and list the functions in those packages in your
> >>>> NAMESPACE
> >>>> file, using
> >>>>
> >>>> importFrom(qgraph, ...)
> >>>>
> >>>> etc.  (If you use Roxygen, you use comments in the source to get it
> >> to
> >>>> put this into your NAMESPACE file.)
> >>>>
> >>>> 2.  Your package works without the dependency, but you may want to
> >>>> issue
> >>>> errors or warnings if it is missing.
> >>>>
> >>>> Then you should put
> >>>>
> >>>> Suggests:  qgraph, ...
> >>>>
> >>>> in the DESCRIPTION file, and to use a function from it, use
> >> something
> >>>> like
> >>>>
> >>>> if (requireNamespace("qgraph")) {
> >>>>     qgraph::foo(...)
> >>>> } else
> >>>>     warning("qgraph is not available.")
> >>>>
> >>>> Duncan Murdoch
> >>>>
> >>>> ______________________________________________
> >>>> R-package-devel using r-project.org mailing list
> >>>> https://stat.ethz.ch/mailman/listinfo/r-package-devel
> >>>
> >
>
>

-- 


*In Jesu et Maria*
*Obrigado*
*Prof. Elias Carvalho*

*"Felix, qui potuit rerum cognoscere causas" (Virgil 29 BC)"Blessed is he
who has been able to understand the cause of things"*

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