This is because "legend" creates a legend only in the current axes. Note that "twinx" creates a separate axes.
You need to manually specify which plot items to show in the legend. http://matplotlib.sourceforge.net/users/legend_guide.html Or, you may use axes_grid.parasite_axes which does this job for you (but do not use this toolkit blindly but read the documentation) http://matplotlib.sourceforge.net/examples/axes_grid/demo_parasite_axes2.html -JJ On Thu, Jan 7, 2010 at 9:19 AM, Manuel Wittchen <manuel.wittc...@gmail.com> wrote: > Hi, > > I'm plotting two y-axis with the twinx() command. But when I'm > creating my legend there is only one entry in the legend-box instead > of two. > Here is my code: > > grafik1 = plt.figure() > > ax1 = grafik1.add_subplot(111) > ax1.plot(TIME, BTM, color='red', label='Biomass') > ax1.set_ylabel('Biomass') > > ax2 = ax1.twinx() > ax2.plot(TIME, FLUOR, label='Productivity') > ax2.set_ylabel('Produktivity') > ax2.set_xlabel('Time') > > grafik1_legend = legend(loc=10) > > ------------------------------------------------------------------------------ > This SF.Net email is sponsored by the Verizon Developer Community > Take advantage of Verizon's best-in-class app development support > A streamlined, 14 day to market process makes app distribution fast and easy > Join now and get one step closer to millions of Verizon customers > http://p.sf.net/sfu/verizon-dev2dev > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
