[R] Should package be reinstalled when exterbal library is changed

Eric Berger er|cjberger @end|ng |rom gm@||@com
Tue Oct 30 19:17:02 CET 2018

Hi Marc,
Normally updating external libraries would not require re-installing an R
package that uses it.
The R package will be able to "find" the new one, because the updated
library would be in the same place (sort of) as the previous library.
On a linux system this is handled by system soft links such as foo.so -->
foo.so.1 changes to foo.so --> foo.so.2
when a version '2' of the foo shared object (the .so.2) is now available to
replace version 1.
On Windows systems a .DLL corresponds to the linux .so.

While you won't need to re-install an R package you will need to start a
new R session.

At a more advanced level you actually can explicitly tell R which .so (or
.dll) files to pull in via the function dyn.load()
See ?dyn.load for details.


On Tue, Oct 30, 2018 at 5:06 PM Marc Girondot via R-help <
r-help using r-project.org> wrote:

> Dear R-experts,
> Some packages need external libraries to be installed. For example ncdf4
> needs netcdf library or flextable need pandoc.
> When there is new version of external library, should the R package be
> installed again to use the new external version, or do the package finds
> itself the new version? Perhaps the answer is "It depends on the
> package", and so how to know if it requires new compilation or not ?
> Thanks
> Marc
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

	[[alternative HTML version deleted]]

More information about the R-help mailing list