def plot_join(px, py, *args, **kwargs):
    from pylab import plot, polyval
    tt = linspace(0, 1, 50)
    plot(polyval(px, tt), polyval(py, tt), *args, **kwargs)
def plot_join(px, py, *args, **kwargs):
    from pylab import plot, polyval
    tt = linspace(0, 1, 50)
    plot(polyval(px, tt), polyval(py, tt), *args, **kwargs)