There appears to be a bug in the macosx backend. When I plot large numbers with small variations in the value, the numbers seem to be coarsely rounded off. This bug doesn't appear with other backends (I tried WxAgg and TkAgg). Below is a simple script showing the problem and the resulting plot on the macosx backend.

Thanks,

-Tony

Mac OS X 10.5.6

Matplotlib svn r6779

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#~~~~~~~~

import numpy as np

import matplotlib.pyplot as plt

x = np.linspace(0, 1)

plt.plot(x, x + 1e6)

plt.show()