[R] Trouble with R and cronjobs
j_turner at ihug.co.nz
Wed Apr 3 04:53:05 CEST 2002
<dstierman <dstierman at micron.com> on April 3 said...>
> It appears that my DISPLAY environmental variable is not
> set. Is that necessary, even when the output of the plot command is to a png
Yes. And No.
A running X server is absolutely necessary for the png() command. If X isn't
running, you get no png(). No jpeg(), either, for that matter. help(png)
These devices [png, jpeg] effectively plot on a hidden screen and then copy
the image to the required format.
In other words, they do their own (hidden) X11 plot, then convert that to a
jpeg or png image. However...
> Can someone tell me how to fix this?
1) have X running all the time (yuck).
2) install ghostscript (if you don't have it already), and use
If it *must* be png format, I'd pick 2. For quality plots over web services,
you really can't beat the pdf() driver, though. Yum.
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