[R-pkg-devel] "Progress reports" for examples in packages.

[Iñaki Ucar]

Which line of code is it?

Iñaki

On Tue, 2 Jul 2019 at 11:32, Rolf Turner <r.turner using auckland.ac.nz> wrote:
>
>
> Many thanks to Henrik Bengtsson and Martin Maechler for pointing out
> that I can monitor progress by looking at the file
>
>      "mypkg.Rcheck/mypkg-Ex.Rout"
>
> e.g. by using "tail -f".  This strategy indeed revealed where the hangup
> was happening.  I wrapped a line of the examples in \dontrun{} and
> checked the package again.  Now the checking completes in finite time! :-)
>
> However I remain puzzled as to *why* the line in question induces a
> hangup.  When I load the package and run that same  line from the
> command line, a result is returned within about 5 seconds of "wall time"
> (or less).
>
> Another strangeness:  The line prior to that which I wrapped in
> \dontrun{} took a very long time to return a result, although the
> command did eventually complete (after which everything ran swiftly).
> But when I run this same line from the command line it completes
> *instantaneously*.
>
> Why on earth would commands be slow, or not execute at all, when run
> under the aegis of "R CMD check", but execute swiftly from the command line?
>
> I think it would be unwise of me to ignore the fact that something
> strange is going on here, but I'm damned if I can see how to go about
> tracking the strangeness down so as to be able to remedy it.
>
> My usual practice when trying to get a handle on something that I don't
> understand is to insert browsers() into the code at strategic points.
> See fortunes::fortune(158).  That's of no help in the current context in
> which the problem only arises when R CMD check is being run.
>
> Can anyone suggest a clever means by which I might determine the
> "magnitude and direction of my stupidity"?
>
> cheers,
>
> Rolf
>
> --
> Honorary Research Fellow
> Department of Statistics
> University of Auckland
> Phone: +64-9-373-7599 ext. 88276
>
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-- 
Iñaki Úcar