[R-pkg-devel] Note: significantly better compression could be obtained ...

Rolf Turner r@turner @end|ng |rom @uck|@nd@@c@nz
Thu Mar 4 10:24:34 CET 2021

On Thu, 4 Mar 2021 08:44:31 +0100
Sebastian Meyer <seb.meyer using fau.de> wrote:

> Am 04.03.21 um 01:41 schrieb Rolf Turner:
> > 
> > ... by using R CMD build --resave-data
> > 
> > But I *did* use that flag with my build command!!!  And yet "R CMD
> > check" seems to think that I didn't!
> Just to be sure: Are you running R CMD check on that freshly built
> tarball or is devtools::check() involved?

The former.  I have never used devtools::check().
> > 
> > I have done "R CMD build --resave-data kanova"  (where "kanova" is
> > the name of the package in question), to make sure that I didn't
> > fumble-finger somewhere, but there's no change.  I always get that
> > NOTE.
> > 
> > How on earth can I track down what's going wrong?
> - Does the R CMD build log actually show "re-saving image files" or
> "re-saving sysdata.rda"?

Dunno what you mean by the "R CMD build log".  I could grepped
"re-saving" on all files and came up empty handed.

> - Have you set the BuildResaveData field in your DESCRIPTION file?


> This would take precedence over the --resave-data command line switch.
> - Have you tried running ) on your source data
> directory before building the package? Does that reduce the size of
> your data files?

Never heard of that.  Tried it just now and it reduced the size from
285607 bytes to 161743 bytes.  That's substantial I guess.


> You'll get the NOTE when R CMD check finds that running
> tools::resaveRdaFiles() on the data directory would reduce a file's
> size by more than 10% with a different type of compression (if the
> original size is >10KB).

Now that I have applied tools::resaveRdaFiles(), I no longer get
the NOTE from R CMD check.  So I guess my problem is solved.  Thanks.

But this still leaves the question:  Why the <expletive deleted> is
R CMD check telling me to use the flag --resave-data, when I *just did



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