[R] Create png graph from script?
garry.kremer at convergys.com
Fri Mar 8 22:08:48 CET 2002
I am looking for a way to create png format files from a script that runs
from crontab. I would like to avoid ghostscript or depending on a
particular x11 device being available. Any help is appreciated.
I am running R Version 1.4.1 on Solaris 2.6.
If I can rely on an x11 device being available I can achieve the result as
$ /fred/R-1.4.1/bin/R --no-save <rbatchtest
$ cat rbatchtest
If I try to run this without the x11 command I get the following error:
Error in X11(paste("png::", filename, sep = ""), width, height,
unable to start device PNG
In addition: Warning message:
unable to open connection to X11 display`'
I'm not comfortable about relying on an x11 device to be available in the
middle of the night when the script runs from cron.
I know I can create postscript and rely on ghostscript to do the conversion
but the ghostscript licensing is a concern.
Is there such a concept as a "dummy" x11 device or other creative solution?
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