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.
Details below.
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
follows:
$ /fred/R-1.4.1/bin/R --no-save <rbatchtest
$ cat rbatchtest
x11("10.20.30.400:0")
png(filename="batchtest.png")
plot(1,1)
dev.off()
$
If I try to run this without the x11 command I get the following error:
Error in X11(paste("png::", filename, sep = ""), width,
height,
pointsize, :
unable to start device PNG
In addition: Warning message:
unable to open connection to X11 display`'
Execution halted
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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