spgrass6 and initGRASS

On Sun, 6 Dec 2009, Patrick Giraudoux wrote:

Dear all,

I am trying to init a GRASS session from within R, using the function 
initGRASS from the package spgrass6. GRASS is installed in two ways 
on my computer (here, the OS is Windows XP): with QGIS metis 
(precompiled version including grass 6.3 (2008)) and grass 6.4.0svn, 
just freshly installed with the Osgeo4W installer.

In both cases I get the same result:

initGRASS("C:/Program Files/Quantum GIS/grass",home="U:/Documents and 

Settings/pgiraudo",override=T)
Error in Sys.setenv(GISRC = gisrc) : wrong length for argument

initGRASS("C:/OSGeo4W/bin",home="U:/Documents and 

Settings/pgiraudo",override=T)
Error in Sys.setenv(GISRC = gisrc) : wrong length for argument

Any idea about what happens ?

No, without the output of traceback(), it isn't obvious, although here 
traceback() might not help. Run under debug(initGRASS) to the step 
before, that is:

        gisrc <- system(paste("g.dirseps.exe -g",
            shQuote(Sys.getenv("WINGISRC"))), intern=TRUE)

then run:

Sys.getenv("WINGISRC")
shQuote(Sys.getenv("WINGISRC"))
gisrc

and try to see what is going on. At this stage, Sys.getenv("GISRC") 
should be "junk", assigned a couple of lines earlier.

Maybe the grass-stats list would have a higher proportion of users of 
both GRASS and R.

Hope this helps,

Roger

Patrick