As I har problems installing the Cairo package, I went for Henriks solution
- and it works almost perfect. I would like to have been able to generate
transparent png.

Thanks for the help
Ulrik

On 18/04/07, Henrik Bengtsson <hb@stat.berkeley.edu> wrote:
>
> Or see png2() in R.utils, which imitates png() but uses bitmap(),
> which in turn uses postscript-to-png via ghostscript.  BTW, personally
> I think PNGs generated via bitmap() look way better than the ones
> generated via png().
>
> /Henrik
>
> On 4/17/07, Jeffrey Horner <jeff.horner@vanderbilt.edu> wrote:
> > Ulrik Stervbo wrote:
> >  > Hello!
> >  >
> >  > I am having issues trying to plot to a ong (or jpg)  when the R-code
> in a
> >  > bash script is executed from cron.
> >  >
> >  > I can generate a pdf file, but when I try to write to a png, the file
> is
> >  > created, but nothing is written. If I execute the bash script from my
> >  > console, everything works file. Any ideas?
> >  >
> >  > In my cron I have SHELL=/bin/bash - otherwise /bin/shell is used and
> the
> >  > folowing enery, so example is executed every minute
> >  > * * * * * [path]/example.sh
> >  >
> >  > I am running
> >  > R version 2.4.1 (2006-12-18)
> >  >
> >  > Here's a minimal example - two files one R-script ('example.r') and
> one
> >  > bash-script ('example.sh')
> >  >
> >  > example.r
> >  > # Example R-script
> >  > x <- c(1:10)
> >  > y <- x^2
> >  > png(file="example2.png")
> >  > #pdf(file="example2.pdf")
> >  > plot(x,y)
> >  > graphics.off()
> >  >
> >  > example.sh
> >  > #/bin/bash
> >  > #
> >  > # Hello world is written to exhotext every time cron executes this
> script
> >  > echo "Hello world" > echotext
> >  > # This works, but not when executed from cron
> >  > n=`R --save < example.r`
> >  > # using exec as in `exec R --save < example.r` dosent work with cron
> > either
> >  > # This also works, but nothing is written to the png when executed
> > from cron
> >  > R --save <<RSCRIPT
> >  > x <- c(1:10)
> >  > y <- x^2
> >  > png(file="example2.png")
> >  > #pdf(file="example2.pdf")
> >  > plot(x,y)
> >  > graphics.off()
> >  > #dev.off() dosent work at all when executed from cron
> >  > RSCRIPT
> >
> > The png() device requires an X server for the image rendering. You might
> > be able to get away with exporting the DISPLAY environment variable
> >
> > export DISPLAY=:0.0 # try and connect to X server on display 0.0
> >
> > within your script, but it will only work if the script is executed by
> > the same user as is running the X server, *and* the X server is running
> > at the time the script is executed.
> >
> > There are a handful of packages that will create a png without the
> > presence of an X server, and I'm partial to Cairo (since I've done some
> > work on it). You can install the latest version like this:
> >
> > install.packages("Cairo",,'http://rforge.net/',type='source')
> >
> > Cairo can also outputs nice pdf's with embedded fonts... useful if you
> > want to embed high-quality OpenType or TrueType fonts.
> >
> > Best,
> >
> > Jeff
> > --
> > http://biostat.mc.vanderbilt.edu/JeffreyHorner
> >
> > ______________________________________________
> > R-help@stat.math.ethz.ch mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>

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