Glen,
Funny, I ran into exactly the same problem earlier that week. My guess is that 
you use numpy, right ? 0.9.8 ? On a 64b machine ?

If that's the case, you should have the same problem with divmod and numpy 
each time you use float64 as dtype: each element is a float64scalar that 
divmod doesn't know how to process. Downcasting to float32 does the trick 
(either by forcing it as dtype, or using a  python float().

According to the numpy list, the problem has been corrected in the SVN 
version. As I didn't want to install the SVN version yet, I found this 
workaround with matplotlib:

in matplotlib/dates.py, change line 155 from
remainder = x - ix
to
remainder = float(x) - ix

That's enough to force the conversion float64scalar to float.

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