Hi Sebastian,
Sebastian Meyer wrote on 2020-07-23 16:52:
Back to the original topic:
THX!
Calling graphics.off() in example code will also disturb standard R CMD
check. Before running the examples, R CMD check opens a pdf device to
store any graphics output [1]. You will find the resulting pdf file in
{PACKAGE}.Rcheck/{PACKAGE}-Ex.pdf after R CMD check.
Ah! For years I was wondering where the PDF comes from.
R CMD check will eventually fail from trying to close this pdf device
after running the examples [2], if you have already closed all graphics
devices (including this pdf device) through code in your examples. This
is where the
Error in grDevices::dev.off() :
cannot shut down device 1 (the null device)
Execution halted
actually came from.
OK, now I have:
if (file.exists("myfile") & !is.null(dev.list()["png"]) {
invisible(dev.off(dev.list()["png"]))
}
You made my day. No error in check() any more.
Finally, […] the png device may not even be available.
Ouch!
So it is reasonable to condition on
capabilities("png")
Done.
or to put such examples in \donttest.
It was already in \donttest{} but check() ignored that.
HTH!
It did. Additionally I've learned a new abbreviation...
Helmut
--
Ing. Helmut Schütz
BEBAC – Consultancy Services for
Bioequivalence and Bioavailability Studies
Neubaugasse 36/11
1070 Vienna, Austria
E helmut.schu...@bebac.at
W https://bebac.at/
F https://forum.bebac.at/
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