spgrass6 and initGRASS

Have tried the following:

initGRASS("C:\\OSGeo4W\\bin",home="U:\\Documents and 
Settings\\pgiraudo\\",override=T)
initGRASS("C:\\Program Files\\Quantum GIS\\grass",home="U:\\Documents and 
Settings\\pgiraudo",override=T)
initGRASS("C:\\OSGeo4W\\bin",override=T)

with the same results...

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

Settings\\pgiraudo\\",override=T)
Error in system(paste("g.dirseps.exe -g", shQuote(Sys.getenv("WINGISRC"))), 
:
g.dirseps.exe not found

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",override=T)

Error in Sys.setenv(GISRC = gisrc) : wrong length for argument

Quite puzzling since g.dirseps does not give a message "unknown command" when 
tried within grass (thus it is suppose to be in the GRASS programme)

Patrick



Roger Bivand a ?crit :

On Mon, 7 Dec 2009, Patrick Giraudoux wrote:

Here is the result:

library(spgrass6)

debug(initGRASS)

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

Settings/pgiraudo/",override=T)

(...)

Browse[2]>
debug: gisrc <- system(paste("g.dirseps.exe -g", 
shQuote(Sys.getenv("WINGISRC"))),
  intern = TRUE)
Browse[2]> Sys.getenv("WINGISRC")
                                      WINGISRC
"U:/Documents and Settings/pgiraudo/\\.grassrc6"
Browse[2]> shQuote(Sys.getenv("WINGISRC"))
[1] "\"U:/Documents and Settings/pgiraudo/\\.grassrc6\""
Browse[2]> gisrc
Error: object 'gisrc' not found

Could you try both not setting home= (you get a temporary folder that is 
deleted when you exit R), or setting

home="U:\\Documents and Settings\\pgiraudo"

without the trailing forward slash?

This a problem connected to protecting spaces on the one hand and system 
specific directory separators on the other, I think.

Roger

Beforehand, the first time I run 
initGRASS("C:/OSGeo4W/bin",home="U:/Documents and 
Settings/pgiraudo/",override=T), I got:

initGRASS("C:/OSGeo4W/bin",home="U:/Documents and 
Settings/pgiraudo/",override=T)
Error in system(paste("g.dirseps.exe -g", 
shQuote(Sys.getenv("WINGISRC"))), :
g.dirseps.exe not found

Then, if I try the same commande on QGIS Metis, I got:
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


Best,

Patrick







Roger Bivand a ?crit :

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