[GRASS-stats] GRASS can't find R packages from personal library on Windows

[Roger Bivand]

On Thu, 17 Nov 2016, Helmut Kudrnovsky wrote:

>> My Windows 7, GRASS 7.0.4 shows identical .libPaths() values both inside
>> and out with RGui. I don't know how the location of the personal library
>> folder is recorded - is it in the registry? How might one know? It looks
>> like:
>>
>> Sys.getenv("R_LIBS_USER") 
>
> tested within a winGRASS7.0.5 session:
>
>> Sys.getenv("R_LIBS_USER")
> [1] "C:\\Users\\test/R/win-library/3.3"
>> .libPaths()
> [1] "C:/Program Files/R/R-3.3.1/library"
>
> R_LIBS_USER is listed there within the winGRASS session, but the path itself
> looks odd.

Unfortunately, I couldn't reproduce this with stand-alone GRASS 7.0.5 or 
7.2, Windows 7 Pro, R 3.3.2. I see the same .libPaths() values inside and 
outside. But see below - I found out how to reproduce the problem 
predictably.

The reason was (of course) that I'd forgotten that I had set R_LIBS_USER 
in Control Panel -> System and Security -> System -> Advanced system 
settings -> Environment Variables. I'd done this as a response to the 
extra work caused at each annual change of the default address as R's 
version was incremented. See also:

https://stat.ethz.ch/R-manual/R-devel/library/base/html/libPaths.html

So a workaround might to use the R_LIBS_USER environment variable in that 
setting, checking that the directory exists. R uses it internally as 
generated, but doesn't export it. I don't know how this plays 
cross-platform.

Best wishes,

Roger

>
> outside a winGRASS7.0.5/7.2.svn session, everthing is ok with these
> variables (see above).
>
>
>
> -----
> best regards
> Helmut
> --
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-- 
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 91 00
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