On Tue, 3 Feb 2004, Philippe Glaziou wrote: > @biology.nmsu.edu <[EMAIL PROTECTED]> wrote: > > I would like to construct a PHP script that runs R to generate a > > graphics file. Running R itself is no problem. However, it seems > > impossible to instantiate one of the graphics devices to create > > output. For example, the "normal" bitmap devices (e.g., jpeg, png, > > etc.) are derived from X11, which requires a display. This seems > > true, even if no output is ever directed to a real display.
It _is_ documented on the help page, and output _is_ directed to a real display: you just mever see it. It is possible make use a virtual display such as that provided by Xvfb. > > For some reason, the postscript device seems to suffer from similar > > problems. > > > > Is there a trick to creating a graphics device in the absence of an > > actual display in order to create an image in a file? > > > If you need a bitmap graphic file, I would suggest the use of > ImageMagick: You may as well use the bitmap() device built into R, which is also a wrapper for the use of ghostscript. That too is described on the help page. I have never seen a reported problem with getting postscript output from a script. After reading the posting guide, please give us some useful details of what happened. > cunegonde:~/tmp> ls > foo > > cunegonde:~/tmp> cat foo > pdf(file="g.pdf") > plot(1:5) > dev.off() > > cunegonde:~/tmp> R --no-save <foo>/dev/null && convert g.pdf g.png > > cunegonde:~/tmp> ls -g > -rw------- 1 glaziou 3374 2004-02-03 11:58 g.pdf > -rw------- 1 glaziou 4115 2004-02-03 11:58 g.png > -rw------- 1 glaziou 80 2004-02-03 11:58 foo > > > This works from a unix console without X running (the postcript > device works similarly on my machine). R can easily be fed this > way with a file and parameters passed from a php script. > > -- Brian D. Ripley, [EMAIL PROTECTED] 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 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html