Both run from terminals and png.R will run without a normal X server if Xvfb is running.
Neither runs under PHP, though (when invoked as "R --no-save < xxx.R").
They yield the following errors (with the R startup banner deleted for compactness):
could not open PNG file `g.png'
cannot open `pdf' file argument `/usr/pkg/share/httpd/htdocs/test-R/g.pdf'
From the evidence above, I'd guess a file permission error. The web server probably runs as the user "apache" or something similar -- does that user have write permission to the place where you are trying to create the images?
Try writing to "/tmp/g.png" and "/tmp/g.pdf" and see if the files get created.
HTH,
Joe
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