[GRASS-stats] R packages and GRASS

[Roger Bivand]

On Thu, 5 Nov 2009, Felipe Carrillo wrote:

> Hi all: I'm brand new to GRASS and this list and just wanted to see if 
> someone could point out to what I need to synchronize R and GRASS. I 
> already downloaded GRASS 6.3, spgrass6 and dependencies and at my first 
> attempt something is happening but I can't quite see a way to import 
> data into R or run commands from R. I ran into the code below yesterday 
> but I can't figure out how to run it from R.

I replied offlist to a mail directly to me suggesting to Felipe that he 
post (done), that he read the PDFs shipped with spgrass6 (he hasn't), and 
to decide which mode he needs - R within GRASS or R freestanding using 
GRASS in a temporary location (hasn't done that either), then read the 
help pages (unknown).

system.file("doc", package="spgrass6")

shows where the PDFs live in an installed package.

He could also watch:

http://spatial.nhh.no/wun09/wun_grass.swf

which shows the use of the interface in a GRASS 6.3 Windows setting, but 
before the important update to replace the direct use of system() with 
execGRASS() at the user level.

I think that until these recommendations are followed, he's unlikely to 
gain from any further advice. I don't have time to handhold. He has only 
said that he is using GRASS 6.3, but not his system, or R's sessionInfo().

Roger

> I tried: system("g.region rast=elevation.dem") but I get an error 
> message. Thanks
> # set region:
> g.region rast=elevation.dem
>
> # extract some random points from an elevation dataset
> v.random out=rs n=300
>
> # create attribute table:
> v.db.addtable map=rs columns="elev double"
>
> # extract raster data at points
> v.what.rast vect=rs rast=elevation.dem column=elev
>
> # simple display:
> d.rast elevation.dem
> d.vect rs size=4
>
> # start R
> R
>
>
> Felipe D. Carrillo
> Supervisory Fishery Biologist
> Department of the Interior
> US Fish & Wildlife Service
> California, USA
>
>
>
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> http://lists.osgeo.org/mailman/listinfo/grass-stats
>

-- 
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