[R] minor version upgrade requires library refresh?

Ross Boylan ross at biostat.ucsf.edu
Tue Feb 18 18:13:45 CET 2014

On Fri, 2014-02-14 at 17:47 -0800, David Winsemius wrote:
> On Feb 13, 2014, at 11:36 AM, Ross Boylan wrote:
> > If R changes from 3.0.1 to 3.0.2, or more generally from m.n.p to m.n.q, 
> > is it necessary to refresh libraries to match the version, e.g., with 
> > update.packages(checkBuilt=TRUE, ask=FALSE)?  The R Windows FAQ 2.8 says
> > "For those with a personal library (folder R\win-library\x.y of your 
> > home directory, R\win64-library\x.y on 64-bit builds), you will need to 
> > update that too when the minor version of R changes (e.g. from 3.0.2 to 
> > 3.1.0)."
> > 
> When "n" changes you need to update any existing library.
> > This suggests that in m.n.q n is the minor version (which would make q 
> > the release?), and that the minor version does not change between 3.0.1 
> > and 3.0.1.
> Huh?
The FAQ refers to the "minor version" but does not define it, except by
example.  I'm trying to figure out if a change in p in m.n.p counts as a
change in the minor version number, and hence requires a library update.
I considered p a minor version number (e.g., in the subject line of the
message) and so found the FAQ ambiguous.

Both your rule ("when n changes...") and the docs suggest p does not
count as a minor version number, though neither is explicit.  Logically,
the fact that a change in n requires library updates provides no
information about a change in p, though the usual reading is "p doesn't
matter" or "when m.n stays the same no update is necessary."


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