[R] X11, interactive device

[Don MacQueen]

As far as I know, your options are (1) run Xvfb on the unix box, or 
(2) use the bitmap() device instead of jpeg(). Option 2 will require 
that ghostscript also be installed on the unix box.

Strictly speaking, it doesn't have to to be Xvfb. The requirement is 
that an X server be running.

The R on that unix box probably does have an installed interactive 
device, but it is not available unless an X server is running, hence 
your FALSE from dev.interactive().

-Don

At 12:49 PM +0200 6/21/05, powdersoul at web.de wrote:
>Hey,
>
>i'm trying to set up an cgi web-application that produces maps and 
>other graphics with R. for local testing i used my laptop which has 
>an win xp OS. there everything works fine. now i try to move the 
>whole system over on an unix machine, mainly because i want to 
>establish a connection to a database. anyway, i'm using R 2.0.0 on 
>an other computer in a local network. here comes my problem:
>
>i can't create jpeg-files, neither by starting R via my cgi-script 
>nor by pasting the syntax directly into R. both ways i get the 
>following error message:
>
>error in X11; unable to start device JPEG; could not open JPEG file.
>
>i found out that there is no interactive graphic device for the 
>installed R-Version or it is not set correctly. as i tried 
>dev.interactive(), the response was [1] FALSE.
>
>i'm a bit lost at the moment. i wonder if there is a chance to 
>change or modify the interactive graphic device or if i really need 
>to run Xvfb "device" as someone suggested before on the R-help 
>mailing list. does someone has experience with this kind of trouble, 
>any help available from somewhere?
>
>thanks in advance, lars
>
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-- 
--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA