[R] Error when calling (R 4.0.x on Windows) from Python

[Bill Dunlap]

Note that in R-3.6.3 commandArgs() does not include the arguments
intended to be processed by the shell, "1>", "arguments.txt", etc.,
but in R-4.0.3 it does include them.  It is as though an R shell()
command was replaced by a system() command so cmd.exe didn't get a
chance to process the command line.

-Bill

On Wed, Jan 27, 2021 at 12:39 AM Martin Maechler
<maechler using stat.math.ethz.ch> wrote:
>
> >>>>> Martin Maechler
> >>>>>     on Tue, 26 Jan 2021 12:37:58 +0100 writes:
>
> >>>>> Marcel Baumgartner
> >>>>>     on Tue, 26 Jan 2021 08:55:48 +0100 writes:
>
>     >> Dear all, my colleague posted our issue on stackoverflow:
>
>     >> Calling R script from Python does not save log file in
>     >> version 4 - Stack Overflow
>     >> [https://stackoverflow.com/questions/65887485/calling-r-script-from-python-does-not-save-log-file-in-version-4]
>
>     >> It is about this kind of call to R:
>
>     >> R.exe -f code.R --args "~/file.txt" 1> "~/log.txt" 2>&1".
>
>     >> The issue is that the log.txt file is not created when
>     >> running R 4.x.x. The same code works perfectly fine with
>     >> R 3.6.x.
>
>     >> Any idea what's going wrong as of version 4? Regards
>     >> Marcel
>
>     > Dear Marcel, I think the solution is embarrassingly
>     > simple:
>
>     >> From the SO post, where she showed a bit more detail than you
>     > show here, it's clear you have confused 'R.exe' and
>     > 'Rscript.exe' and what you say above is not true:
>
>     > 'R.exe' was used for R 3.6.0 but for R 4.0.3, you/she used
>     > 'Rscript.exe' instead.
>
>
>     > ... as you've noticed now, they do behave differently,
>     > indeed!
>
> Well, this was not the solution to their -- Windows-only -- problem.
> The problem *is* indeed visible if they only use  R.exe  (also
> for R 4.0.3).
>
> I've commented more on the SO issue (see above),
> notably asking for a *minimal* repr.ex. (reproducible example),
> and one *not* using "<YOUR PATH>" and setwd() ..
>
> Martin
>
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