[GRASS-stats] Error when starting grass from R (grass installed thru osgeo4w)

[Veronica Andreo]

Hello,

I am preparing a one week GRASS GIS course and I mostly expect Windows
users, so I recommend to install from OSGeo4W that allows to easily install
also QGIS, msys (to get nice bash tricks) and other libraries that are then
needed for some grass add-ons.

The last day of the course, I'll show the connection with R. Now, starting
R within a grass session works as expected. But I get errors when trying to
initialize GRASS (installed from OSGeo4W) from R console. I am following
the instructions in the wiki [0]

First, I had to change the slashes from windows type, to linux type
(because I got:
Error: '\O' in an unrecognized escape in character string ""C:\O").

After that, I get the following:

> initGRASS(gisBase = 'C:/OSGeo4W64/apps/grass/grass-7.4.0', gisDbase =
'C:/Users/RETA/Documents/grassdata', location = 'nc_spm_08_grass7', mapset
= 'user1', SG='elevation')
Error in if (!compatible) { : argumento tiene longitud cero
Además: Warning messages:
1: In system(paste("g.dirseps.exe -g", shQuote(Sys.getenv("GISRC"))), :
comando ejecutado 'g.dirseps.exe -g "junk"' tiene estatus 309
2: In system(paste("g.dirseps.exe -g", shQuote(gisDbase)), intern = TRUE) :
comando ejecutado 'g.dirseps.exe -g "C:/Users/RETA/Documents/grassdata"'
tiene estatus 309
3: In dir.create(loc_path) :
cannot create dir 'NA\nc_spm_08_grass7', reason 'No such file or directory'
4: In dir.create(paste(loc_path, "PERMANENT", sep = "/")) :
cannot create dir 'NA\nc_spm_08_grass7\PERMANENT', reason 'No such file or
directory'
5: In dir.create(paste(loc_path, mapset, sep = "/")) :
cannot create dir 'NA\nc_spm_08_grass7\user1', reason 'No such file or
directory'
6: In system(paste("g.version", get("addEXE", envir = .GRASS_CACHE), :
comando ejecutado 'g.version.exe' tiene estatus 309

Any hints? I also attach a screenshot with the message that appears (I
cannot copy/paste the text in that message)

Thanks much in advance!
Vero

[0] https://grasswiki.osgeo.org/wiki/R_statistics/rgrass7#GRASS_within_R
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