[R] unix environment variables under R

[Uwe Ligges]

Jan Malte Wiener wrote:
> 
> Jason Turner wrote:
> > On Tue, Oct 29, 2002 at 10:11:09AM +0100, Jan Malte Wiener wrote:
> > ...
> >
> >>thought a UNIX environment variable could be the solution, but R doesn't
> >>seem to know about the environment variables.
> >>e.g. >> source("$PROJECT/xxx.R") results in
> >> >> Error in file(file, "r") : unable to open connection
> >>
> >>is there something like environment variables for R?
> >
> >
> > Yep.  Sys.getenv()
> >
> > Cheers
> >
> > Jason
> 
> thanks for your answer,
> but how do i source a file using that environment variable; if the
> environment variable holds a path to a directory and i want to source a
> file within that directory??
> e.g.:
> Sys.putenv("ABC"="~/R-Stuff/")
> in ~/R-Stuff there a bunch of R-files
> now i want to source one of these R-files using the ABC environment
> variable.
> sorry, but i do not know how to do this ?

 directory <- Sys.getenv("ABC")
 source(paste(directory, "anRfile.R", sep = ""))

Uwe Ligges
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