[R] unix environment variables under R

[partha_bagchi@hgsi.com]

One way to do this would be to change to the $PROJECT directory and then 
use source. For example:

> setwd(Sys.getenv("PROJECT"))
> source("xxx.R")

If you wish to remain the current directory after executing the souce then 
save the current location with:

> currdir <- getwd()

Then after sourcing change back to the current directory:

> setwd (currdir)

So the sequence of commands could be:

> currdir <- getwd()
> setwd(Sys.getenv("PROJECT"))
> source("xxx.R")
> setwd (currdir)

HTH,
Partha.





Jan Malte Wiener <jan.wiener at tuebingen.mpg.de>
Sent by: owner-r-help at stat.math.ethz.ch
10/29/2002 06:37 AM

 
        To:     Jason Turner <jasont at indigoindustrial.co.nz>, R <r-help at stat.math.ethz.ch>
        cc: 
        Subject:        Re: [R] unix environment variables under R


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 ?

greetinx jan

--
Jan Malte Wiener
Max-Planck-Institute for Biological Cybernetics
Spemannstr. 38, 72076 Tuebingen, Germany
Tel.: +49 7071 601 631
Email: jan.wiener at tuebingen.mpg.de

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