[R] Producing png plot in batch mode

[Prof Brian Ripley]

?png explains this to you and gives alternatives.

On Fri, 23 Jun 2006, Vittorio wrote:

> I have set up an R procedure that is launched every three hours by
> crontab in a unix server. Crontab runs at regular intervals the
> following line:
> R CMD BATH myprog.R

BATCH?

> myprog.R (which by the way uses
> R2HTML) should create an updated png graph  to be referred to and seen
> in an intranet web-page index.html.
>
> The problem is that both:
>
> png
> (....)
> plot(...)
> dev.off()
>
> AND:
>
> plot(...)
> HTMLplot(...)
>
> fail when
> launched in a batch manner compalining that they need an X11() instance
> to be used (I understand that they work only in a graphic context and
> intarictively).
>
> How can I obtain that png file?
>
> Ciao
> Vittorio
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595