There are many non-PDL but Perl modules on CPAN for talking to gnuplot. See http://search.cpan.org/search?query=gnuplot&mode=all, and it looks like http://search.cpan.org/~kwmak/Chart-Gnuplot-0.15/lib/Chart/Gnuplot.pm is currently maintained. Writing a simple extension module that sent piddles down a pipe to gnuplot should be straightforward, and people (myself included) would be happy to help if you decided to go for it but needed some ideas.
David -- Sent via my carrier pigeon.
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