[R] png output in batch

[Prof Brian D Ripley]

On Wed, 25 Oct 2000, Deborah Swayne wrote:

> I'm trying to use R in a cgi script to produce graphics
> files in png format, and I'm having a problem.
> 
> My shell command line looks like this:
>   R </usr/dfs/auction/eligibility.R --no-save  >/tmp/R.out
> and the line in the R script looks like this:
>  png ("foo.png", pointsize=18)
> 
> If I run outside the cgi context, it runs great.  When
> run as in a cgi script, I get this error message:
> 
> Error in X11(paste("png::", filename, sep = ""), width, height, pointsize,  : 
>         unable to start device PNG
> 
> Is there any way to trick this command into doing what I want?
> 
> I can alternatively produce postscript output, and then
> convert to png, but I find the resolution disappointing.
> 
> (I'm using unix.)

There is no way.  png() on Unix depends on having an X server (for the
fonts, basically).  I would use bitmap(), which does produce postscript
output and convert, but you can control the resolution.  (I would
use it even in interactive use.)

-- 
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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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