The upper left y axis tick marks in a scatter_matrix appear to have units/values pulled from the (0, 0) histogram counts, instead of the data values that are used for all other axis tick values.
Example:
In [1]: import numpy as np
In [2]: import pandas as pd
In [3]: pd.__version__
Out[3]: '0.12.0'
In [4]: df = pd.DataFrame(np.random.randn(100,3), columns=['a', 'b', 'c'])
In [5]: pd.tools.plotting.scatter_matrix(df)
Out[5]:
array([[<matplotlib.axes.AxesSubplot object at 0x1071d5d90>,
<matplotlib.axes.AxesSubplot object at 0x1089aa0d0>,
<matplotlib.axes.AxesSubplot object at 0x1071e36d0>],
[<matplotlib.axes.AxesSubplot object at 0x10a7d4f90>,
<matplotlib.axes.AxesSubplot object at 0x10a7fd450>,
<matplotlib.axes.AxesSubplot object at 0x10a8197d0>],
[<matplotlib.axes.AxesSubplot object at 0x10a83bf90>,
<matplotlib.axes.AxesSubplot object at 0x10a84fe50>,
<matplotlib.axes.AxesSubplot object at 0x10a886310>]], dtype=object)
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