Adding an arbitrary line to a matplotlib plot in ipython notebook

Question

I\'m rather new to both python/matplotlib and using it through the ipython notebook. I\'m trying to add some annotation lines to an existing graph and I can\'t figure out ho

Answer 1

It's not too late for the newcomers.

plt.axvline(x, color='r')

It takes the range of y as well, using ymin and ymax.