Good points, but the thing about matplotlib is it's Python so you have an integrated solution for scientific data analysis and visualization. Instead of having

Good points, but the thing about matplotlib is it's Python so you have an integrated solution for scientific data analysis and visualization. Instead of having 10 different tools, you have one. Still, I find the plots on the gnuplotting site to be quite impressive -- at least as good as matplotlib. (I end up using both, gnuplot -- b/c of emacs integration -- and matplotlib.)