On 15/07/19 12:19 PM, Duncan Murdoch wrote:
On 14/07/2019 7:52 p.m., Rolf Turner wrote:
In a package (say "clyde") that I am building I save a number of
datasets in clyde/data via something like:
save(melvin,file="~/<whatever>/clyde/data/melvin.rda")
When I build "clyde" I now get warnings like unto:
WARNING: Added dependency on R >= 3.5.0 because serialized objects in
serialize/load version 3 cannot be read in older versions of R.
File(s) containing such objects: 'clyde/data/melvin.rda'
If I put the argument "version=2" into my save() call, the warnings go
away.
What are the implications of this?
What are the consequences/what is the downside of setting version=2?
What are the consequences/what is the downside of adding the dependency
on R >= 3.5.0 into my DESCRIPTION file?
The main consequence of setting the R version is that nobody using an
older version could use your package.
I'd suggest this is a good thing, unless you plan to test your package
with those old versions. People should be nudged to upgrade.
Indeed. I agree.
However, some people are stuck on old versions, and they really would miss
out on clyde.
And I'd hate that!!! :-)
I think Travers pointed out the main consequence of forcing version=2:
some things that are very compact in the next version might take a lot
more space in version=2, e.g. x <- 1:1000000.
I don't think that space is a major issue. I managed to tot up the
total size of the data sets, using object.size() and I get 1219824
bytes, i.e. about one and a quarter megabytes. I don't think that's a
worry, so I think I'll stick with version=2.
Thanks Duncan.
cheers,
Rolf
--
Honorary Research Fellow
Department of Statistics
University of Auckland
Phone: +64-9-373-7599 ext. 88276
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