What should be the value of the mean, var, and std of empty arrays? Currently
In [12]: a Out[12]: array([], dtype=int64) In [13]: a.mean() Out[13]: nan In [14]: a.std() Out[14]: nan In [15]: a.var() Out[15]: nan I think the nan comes from 0/0. All of these also raise warnings the first time they are called. Chuck
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