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

[Roger Bivand]

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"

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