[GRASS-stats] R packages and GRASS
There is no menu for R in grass. As I've said, in order to use grass from R (through R package spgrass6), the best option is to start R from the grass console. Perhaps the problem is that you don't know what the grass console is? Then you must get a bit familiar with grass first. Here (http://grass.itc.it/statsgrass/grass6_r_install.html) it's also pretty clear: "Usage You need to start R in a GRASS terminal to make best use of the interface." Agus
Felipe Carrillo wrote:
I looked in the help files and I can't find a way to open R from any of the menu options. I wanted to use GRASS from R but it's ok to open R from GRASS for now so I can get familiar with the program but I eventually want to automate GRASS from R. I tried the commands below in GRASS and they seem to work ok, but I don't know how to interact with R yet. # 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 --- On Thu, 11/5/09, Agustin Lobo <alobolistas at gmail.com> wrote:
From: Agustin Lobo <alobolistas at gmail.com> Subject: Re: [GRASS-stats] R packages and GRASS To: "Felipe Carrillo" <mazatlanmexico at yahoo.com> Date: Thursday, November 5, 2009, 8:58 AM (Disregard the attachment, it was just my signature, I was not aware of sending it, just changed the settings of this account) Are you starting R from within the grass console? Agus Felipe Carrillo wrote:
Agustin: I get the message below while trying to execute from
R
system("g.region rast=elevation.dem")
Warning message:
In system("g.region rast=elevation.dem") : g.region
not found
On the same note, Would you mind sending me the
attachment on a different format? This is a government computer and I don't have outlook to open it. Just copy and paste onto notepad or word if you don't mind. Thanks
Felipe D. Carrillo Supervisory Fishery
Biologist Department of the Interior US Fish & Wildlife Service California, USA
--- On Thu, 11/5/09, Agustin Lobo <alobolistas at gmail.com>
wrote:
From: Agustin Lobo <alobolistas at gmail.com> Subject: Re: [GRASS-stats] R packages and GRASS To: "Felipe Carrillo" <mazatlanmexico at yahoo.com> Cc: "GRASS STATS" <grass-stats at lists.osgeo.org> Date: Thursday, November 5, 2009, 8:04 AM which error? we don't see it. Note you must start R from within the grass console. Actually it's better if, from
the grass
console, you launch xterm & and can start R from the
new
terminal. Agus 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
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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