Hi,
> 1) How should one go about printing a graph in gnuplot?
You can save your graph in a file (png, gif, postscript, ..) and then
print it.
> 2) Is there a way to plot polar coordinates in Maxima?
See these examples made with package draw:
http://www.telefonica.net/web2/biomates/maxima/gpdraw/noncartes
See also that some examples make use of the terminal option this way:
terminal = eps
in order to create a postscript file.
--
Mario