That's reasonable, but I'm wondering why it works the *first* time
it's called in a session. Is this just undefined behaviour (so I
shouldn't be surprised whatever happens)? Again,
$ Rscript -e 'sqrt(-1); Sys.setenv(LANGUAGE="es"); sqrt(-1)'
[1] NaN
Warning message:
In sqrt(-1) : NaNs produced
[1] NaN
Warning message:
In sqrt(-1) : Se han producido NaNs
I should clarify that this really isn't that important for my
workflow, it just seemed like an odd loose end.
Weirdly, I just discovered that Sys.setLanguage(). Don't know how it
differs, but there's a bindtextdomain(NULL) call there which may be the
magic sauce ... ???
sqrt(-1)
[1] NaN
Warning message:
In sqrt(-1) : NaNs produced
> Sys.setLanguage("de")
> sqrt(-1)
[1] NaN
Warnmeldung:
In sqrt(-1) : NaNs wurden erzeugt
> Sys.setLanguage("en")
> sqrt(-1)
[1] NaN
Warning message:
In sqrt(-1) : NaNs produced
On 2023-06-26 9:38 a.m., Dirk Eddelbuettel wrote:
Ben,
POSIX level / glibc level variables are set at process start and AGAIK cannot
really be altered after start. They clearly work when set _before_ calling
sqrt(-1):
$ LANGUAGE=es Rscript -e 'sqrt(-1)'
[1] NaN
Warning message:
In sqrt(-1) : Se han producido NaNs
$ LANGUAGE=de Rscript -e 'sqrt(-1)'
[1] NaN
Warnmeldung:
In sqrt(-1) : NaNs wurden erzeugt
$
I think the `callr` package can help you with this use from with R by
effectively spawning a new process for you. Or, lower-level, you can call
`system()` or `system2()` yourself and take care of the setup.
Cheers, Dirk
--
Dr. Benjamin Bolker
Professor, Mathematics & Statistics and Biology, McMaster University
Director, School of Computational Science and Engineering
(Acting) Graduate chair, Mathematics & Statistics
> E-mail is sent at my convenience; I don't expect replies outside of
working hours.
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