[R-sig-Geo] R/Grass Interface

[Roger Bivand]

On Tue, 14 Apr 2009, milton ruser wrote:

> Nicholas,
>
> I have the same problem, and change to R 2.9.0 and the things works fine
> under windows Vista. But the preparing my command to send to system("...")
> we need to include the .exe on the command. According to Roger Bivand, this
> issue will be solve on next versions.
>
> Try install R 2.9.0 alpha, and good luck.

2.9.0 is due later this week, so I'd wait for the official release. The R 
version isn't the problem - the problem is that (your choice of) Windows 
Native GRASS 6.3, 6.4, GRASS on Cygwin, QGIS (any version) vary in how 
they name executable commands. In principle QGIS runs through msys, so 
sets a Windows environment variable to say so, but things may vary from 
version to version of GRASS through QGIS.

The forthcoming spgrass_0.6-* release tries to centralise the reading of 
the auspices wrt. which Windows version is running, and provides an 
execGRASS() function wrapping a doGRASS() function building a command line 
for system(), and based on parseGRASS(), which reads the GRASS command 
interface description. Unix (GNU Linux/OSX/etc) users have access to the 
source by anonymous CVS on sourceforge on the r-spatial project; a draft 
Windows release is at:

http://spatial.nhh.no/R/Devel/spgrass6_0.6-3.zip

Nicholas - could you please try the draft and see if it helps?

Best wishes,

Roger

>
> best wishes
>
> miltinho
> brazil-toronto
>
> On Mon, Apr 13, 2009 at 5:55 PM, Nicholas N Nagle <
> Nicholas.Nagle at colorado.edu> wrote:
>
>> Dear list,
>> I am trying to load the spgrass6 library from within GRASS.  I am running R
>> 2.8.0 and GRASS6.4 from within QGIS (i.e. Plugins -> GRASS -> Open Grass
>> Tools -> Shell).
>>
>> Here is the problem I am getting:
>>> library(spgrass6)
>> Error in system(paste("g.version", .addexe(), sep = ""), intern = TRUE) :
>>  g.version not found
>> In addition: Warning message:
>> package 'spgrass6' was built under R version 2.8.1
>> Error in library(spgrass6) : .First.lib failed for 'spgrass6'
>>
>> The warning, is usual for me, and has not caused any problems in the past.
>>
>> I don't know if this helps, but I also get:
>>
>>> system("g.version")
>> Warning message:
>> In system("g.version") : g.version not found
>>> system("g.version.exe")
>> GRASS 6.4.0svn (2009)
>>
>> so I CAN run g.version.exe, but not g.version.  Is this a problem for
>> spgrass6?
>>
>> Thanks,
>>
>> Nicholas
>>
>>
>>
>> Nicholas N. Nagle, Assistant Professor
>> University of Colorado
>> Department of Geography
>> UCB 260, Guggenheim 110
>> Boulder, CO 80309-0260
>> phone: 303-492-4794
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at stat.math.ethz.ch
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no