On 6/10/2016 8:28 PM, Allan Haldane wrote:
My understanding is that numpy never upcasts based on the values, it
upcasts based on the datatype ranges.
http://docs.scipy.org/doc/numpy-1.10.1/reference/ufuncs.html#casting-rules
>>> (np.int64(2**6)*np.arange(5,dtype=np.int8)).dtype
dtype('int8')
>>> (np.int64(2**7)*np.arange(5,dtype=np.int8)).dtype
dtype('int16')
fwiw,
Alan Isaac
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