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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