On 22/07/2020 8:36 a.m., Helmut Schütz wrote:
Dear all,
I have two variables, foo and bar. The first is TRUE if a png should be
created and the second is TRUE if an already existing one should be
overwritten.
At the end of the plot I had
if (foo | (foo & bar)) dev.off()
This worked as expected in all versions of my package built in R up to
v3.6.3. However, when I CHECK the package in v4.0.2 I get:
> grDevices::dev.off()
Error in grDevices::dev.off() :
cannot shut down device 1 (the null device)
Execution halted
I tried:
if (foo | (foo & bar)) {
Assuming that foo and bar are each length one variables, this test is
logically equivalent to
if (foo) {
Is that really what you intended?
Duncan Murdoch
dev <- dev.list()
if (!is.null(dev)) {
if (dev == 2) invisible(dev.off())
}
}
without success (same error).
Even the more general
if (foo | (foo & bar)) {
graphics.off()
}
did not work.
The plot is called only in an example of one man-page -- though embedded
in \donttest{}.
Even if I set both foo and bar to FALSE (i.e., the respective part of
the code should not be executed at all), I get the same error.
Any ideas/suggestions?
Regards,
Helmut
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