Hmmm... the short answer is that your call to png() is requiring X11 to
generate the plot. Don't know what version you're running, but prior to
R 2.7.0, all png() calls needed access to the X server to create the
plots (on Unix). But with 2.7.0 and later, png() can be called with
type='cairo' to generate plots without X11 intervention.
If you're running an earlier version of R and you can't upgrade, then
you could install the Cairo package which supports png output without
X11 intervention.
Best,
Jeff
cls59 wrote:
Hey everyone,
I'm part of a team working at NOAA and we have developed a swan script that
analyzes data and generates plots for the forecasters. We are ready to put
the script on the cron and call it a summer but a technical issue has popped
up which has us puzzled.
When we run the script as an unprivileged user, it bails when png() gets
called to open a device for the output. The error is
unable to open connection to X 11 display ' ':
When we run the script as root, everything works like a charm. The user has
ownership of the plotting directories where the script drops it's output.
The unprivileged user can run R interactively, but use of x11() or any other
plotting commands fail.
Any Linux users out there who might have any ideas on how to straighten this
out?
We are using Red Hat Enterprise 4.
-Chuck
--
http://biostat.mc.vanderbilt.edu/JeffreyHorner
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