Ok, new version! Take another look at the screenshot
http://www.math.mcgill.ca/loisel/octave-gui/, there's now also a
prototype plotting widget. It can plot any line soup with Gouraud
shading. I have a helper function myplot.m that turns a [x1 y1;x2 y2;
... ; xn yn] matrix into a line soup and then calls the c++
internal_my_plot function. Also, I have the ability of doing multiple
plots; the plots rescale automatically, etc... Note that gnuplot is
still available, if it works better for you.
Also, David said...