mpl v2.x

In the examplepolar_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'tplt.scatter be replaced withax.scatter?