[R-pkg-devel] Assigning a variable to global environment

[Mark Miller]

I think it would be helpful to describe more deeply what you're trying to
do by this. There's a fair chance there's a better way to do what you're
trying to do.

Mark

On Fri, Dec 11, 2020 at 10:53 AM Tiago Olivoto <tiagoolivoto using gmail.com>
wrote:

> Thank Matt for your response.
> Would be an acceptable solution to check if the variable exists first and
> creating the new variable with a suffix? Please, see the following example
>
>     var_name <-  "name"
>     var_name <- ifelse(exists(var_name),
>                          paste(var_name, "_vct", sep = ""),
>                          var_name)
> and then
>
> assign(var_name, 1, envir = .GlobalEnv)
>
> Cheers,
> Tiago
>
> Em sex., 11 de dez. de 2020 às 15:20, Matt Denwood <md using sund.ku.dk>
> escreveu:
>
> >
> > > On 11 Dec 2020, at 18:32, Tiago Olivoto <tiagoolivoto using gmail.com>
> wrote:
> > >
> > > Hi everyone,
> > > This can be a very simple question, but I really have the following
> > doubt.
> > >
> > > CRAN Policies says that 'Packages should not modify the global
> > environment
> > > (user’s workspace)'. So, may I or may I not create a function that will
> > > call internally the following code? (a simple example)
> > >
> > > assign("name", 1, envir = .GlobalEnv)
> >
> > You may not - and for good reason, as the user may have an existing
> > variable called “name” that will be destroyed by such an action.  If you
> > run "R CMD check —as-cran" on a package containing this code you will
> get a
> > warning (or maybe a note, I can’t remember), and the package would most
> > likely be refused if you tried to submit it to CRAN.
> >
> > Cheers,
> >
> > Matt
> >
> >
> > >
> > > Cheers
> > > Tiago
> > >
> > >       [[alternative HTML version deleted]]
> > >
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> > >
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