from pyx import * g = graph.graphxy(width=8, x=graph.axis.nestedbar()) g.plot([graph.data.file("minimal.dat", xname="$0, 0", y=2), graph.data.file("minimal.dat", xname="$0, 1", y=3)], [graph.style.bar()]) g.writeEPSfile("compare") g.writePDFfile("compare")