mpl v2.x

In the example polar_scatter_demo.py, I guess that the line

area = 200 * r**2 * np.random.rand(N)

should be

area = 200 * r**2

to be consistent with the header docstring which states “Size increases radially…”.

Besides, if I understood correctly, one wants to promote the OO style in the examples. If it's correct, shouldn't plt.scatter be replaced with ax.scatter?