[GRASS-user] Re: problems loading R packages

[Cgeorges]

Hi Malte,

since you are a very beginner with R
I give you some detailed comments on the
R commands/output/requirements:

>> > install.packages(c("sp","spgrass6","rgdal","maptools"),
>> dependencies=TRUE)

You need to install these additional packages in R
to be able to
work with spatial data (sp),
import/export grass data (spgrass),
use gdal lib (rgdal),
and provide more possibilites with maps (maptools).

Those packages are to be downloaded from some server,
compiled and installed, which R all executes semi-automatically.

>> argument 'lib' is missing: using /usr/local/lib/R/site-library

This is the directory where the compiled packages are being installed,
thus, you need full rights to this directory.
I usually install packages as root, which enables them for
all users.

>> Loading Tcl/Tk interface ... done
With this output, a tcl-widget presents you available servers
to download the packages. Did the widget come up?
I assume not, which would explain the following error message:

>> dependencies '?sp?, ?spgrass6?, ?rgdal?, ?maptools?' are not available


Summary:
1. install packages as root
2. R needs to be tcl/tk enabled; tcl/tk installed

Alternatively,
you can download the packages manually
(http://cran.r-project.org,
most recent sp packages at: http://r-spatial.sourceforge.net/)

and install packages manually from some shell with:

R CMD INSTALL packagexy.tar.gz

HTH,
Christian
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