On Thu, Oct 27, 2011 at 8:12 AM, Adam Mercer <ramer...@gmail.com> wrote: > Hi > > I have recently updated to Matplotlib-1.1.0 and now one of my scripts > displays the following warning: > > UserWarning: Legend does not support [[<matplotlib.lines.Line2D object > at 0x1026296d0>]] > Use proxy artist instead. > > http://matplotlib.sourceforge.net/users/legend_guide.html#using-proxy-artist > > The link it refers to doesn't seem to be much help, and I can't see > what I need to do in order to correctly display the legend. Below is > the appropriate plotting section of my script, could anyone offer > suggestions as to how to correctly display the legend? > > # plot size, scale by golden ratio > fig = pyplot.figure() > fig.set_size_inches(10, 10 / ((1 + math.sqrt(5)) / 2)) > date_axes = fig.add_subplot(111) > > # setup secondary axes > value_axes = date_axes.twinx() > > # set plot labels > date_axes.set_xlabel("Date") > date_axes.set_ylabel("Time") > value_axes.set_ylabel("Value") > > # produce plot > morning_plot = date_axes.plot_date(morning[:,0], morning[:,1], 'bo-', ms=4) > evening_plot = date_axes.plot_date(evening[:,0], evening[:,1], 'go-', ms=4) > value_plot = [] > for v in value: > value_plot.append(value_axes.plot_date(w[:,0], w[:,1], 'ro-', ms=4)) > > # legend > date_axes.legend(([morning_plot], [evening_plot], [value_plot]), > ("Morning", "Evening", "Value"), > numpoints=1, loc=0, borderpad=1, shadow=True, fancybox=True) > > # save plot > fig.savefig(plot_file)
Your problem is that value_plot is a list of lists, and not a list of lines. ax.plot_date returns a list of lines, so you need to do value_plot.extend(value_axes.plot_date(w[:,0], w[:,1], 'ro-', ms=4)) rather than calling "append". The legend method expects a list of matplotlib artists, not a list of lists. JDH ------------------------------------------------------------------------------ The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
