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 jo
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
