[Chicago] binned scatterplot

[Oren Livne]

Dear All,

I have two matching arrays, x and y. I'd like to create a histogram of y 
vs. x. Instead of individual scatter points, I'd like to bin them into 
(x,y) combinations that form a 2-D array of cells, count the number of 
points within each cell, color the cell according to its distance from 
the diagonal (y=x), and have its intensity be proportional to the number 
of points in the cell. Is there a clean way of doing this with matplotlib?

Thanks,
Oren