PhilipElson/matplotlib — comment on commit f08efd412cd88c758149af60ba31455a9b99679e
File:  line 0
By PhilipElson:

This was an accidental commit, I was intending to do some more research into why it works before posting it, but any insight would be appreciated.

Code to replicate the original problem:

```
import matplotlib.pyplot as plt
import numpy

z = numpy.arange(1200).reshape(30, 40)

cs = plt.contourf(z)
plt.clabel(cs)
plt.show()
```