Here's a follow-up to my reply to Jaromir Baxa in
http://lists.wfu.edu/pipermail/gretl-users/2009-December/004194.html
in which I noted that for best results with gretl you need a
more recent version of gnuplot than is available via Linux
distros.
I've now added a page to the gretl site on installing gnuplot 4.5
on Linux for use with gretl. There are instructions for building
gnuplot from CVS, but in addition I'm making a pre-built package
available.
This is at
http://gretl.sourceforge.net/gnuplot_for_gretl.html
(it's also linked from the main gretl page, under the "Gnuplot"
heading).
Note that these instructions are not needed if you're using the
packages for MS Windows or OS X, since gnuplot 4.5 is included in
those packages.
Allin Cottrell