[R-sig-Geo] R + GRASS in win XP

[Roger Bivand]

On Sun, 26 Aug 2007, Roger Bivand wrote:

> On Sat, 25 Aug 2007, Michal Gallay wrote:
>
>> Dear R Users,
>>
>> recently I've attempted to run R with GRASS from QGIS GRASS shell in
>> Windows XP. It was my first try and didn't work.
>
> Until very recently, the QGIS/GRASS combination changed so often that it
> wasn't feasible to try to make any interface work. The solution was to
> read and write temporary files manually.
>
> In order to make progress, the exact QGIS release (0.8.1?), and R output
> from sessionInfo() is needed, as well as your commands on (say) spearfish,
> and the verbatin error message and th output of traceback(). My guess is
> that the OS is being recognised in R as "windows", and that file paths are
> being constructed for Cygwin (which works), and which is currently the
> only style available. Almost certainly there are PATH issues too, that is
> that GRASS program executables are not being found, but without more
> information, it is difficult to check.
>
> It is possible that the 0.8.1 release note for Windows:
>
> "If you install QGIS in a path containing spaces (for example "C:\Program
> Files\Quantum GIS") you may experience problems with certain features, in
> particular the GRASS toolbox functions"

It was a combination of path variables with spaces and the apparent need 
to call GRASS commands with *.exe extensions from within R in the GRASS 
shell under GRASS Tools (QGIS 0.8.1). From spgrass6-0.4-1, QGIS/msys/GRASS 
is supported - package revision just submitted to CRAN.

Roger

>
> is relevant.
>
> Hope this helps,
>
> Roger
>
>>
>> Would you know if it is actually possible to run R from GRASS shell in
>> windows environment?
>>
>> I launched GRASS Shell from QGIS menu, which works via Mingw32 navigated
>> to R directory, successfully started R from GRASS Shell and loaded spgrass6
>> package in R.
>>
>> The following "system()" R command didn't work for GRASS commands. I
>> suspect it is related to Mingw32 emulator, but to be honest I haven't got
>> yet to deep into UNIX-Windows programs.
>>
>> Thank you very much for any hints for steps forward.
>>
>> Michal
>>
>> --
>> Michal Gallay
>>
>> Postgraduate Research Student
>> School of Geography, Archaeology and Palaeoecology
>> Queen's University
>> Belfast BT7 1NN
>> Northern Ireland
>>
>> Tel: +44(0)2890 273929
>> Fax: +44(0)2890 973212
>> email: mgallay01 at qub.ac.uk
>> www: www.qub.ac.uk/geog
>>
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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