[Rd] problematic dev.off() after running examples without plots

[Martin Maechler]

>>>>> Thierry Onkelinx via R-devel 
>>>>>     on Tue, 20 Nov 2018 14:16:20 +0100 writes:

    > Dear all, When running R CMD check on our package, we get
    > an error on the examples.

    > Error in grDevices::dev.off() : 
    >  cannot shut down device 1 (the null device)

    > None of the examples in our package generates
    > plots. grDevices::dev.off() is code added by R CMD
    > check. 

Yes, but there's also code added at the very beginning of the
examples R script ( <pkg>-Ex.R ) which opens a pdf device:

  grDevices::pdf.options(width = 7, height = 7, paper = "special", reset = TRUE)
  grDevices::pdf(paste(pkgname, "-Ex.pdf", sep=""), encoding = "ISOLatin1")

and so things should work and do work well for packages without any plots.

You must be doing something particularly strange in some of *your*
examples such as closing all existing devices -- something you should not do:

As a good citizen you close graphic devices that you open but not others.

    > A workaround is to have at least one example which
    > has some plot. Is there a better solution? 

Yes, find the example in your package which does the above
"strange thing" and modify that.

Best,
Martin Maechler
ETH Zurich and R Core Team


    > We are using R 3.5.1

    > Best regards,

    > ir. Thierry Onkelinx Statisticus / Statistician

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