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

Using vlines:

import numpy as np
np.random.seed(5)
x = arange(1, 101)
y = 20 + 3 * x + np.random.normal(0, 60, 100)
p =  plot(x, y, "o")
vlines(70,100,250)

The basic call signatures are:

vlines(x, ymin, ymax)
hlines(y, xmin, xmax)