> The same warning would have been issued from the same place in each of
the variations you tried.
That's not the case, I tried with np.min([1, 2, 3, np.nan]) in a fresh
interpreter and no warning was raised.
Furthermore on my work computer (conda python3.6.2 with pip installed
numpy) I can't get the problem to show at all:
>>> import numpy as np
>>> np.version.version
'1.14.0'
>>> np.min([1., 2., 3., 4., np.nan])
nan
>>> np.min([1., 2., 3., np.nan, 4.])
nan
>>> np.min([1., 2., np.nan, 3., 4.])
nan
>>> np.min([1., np.nan, 2., 3., 4.])
nan
>>> np.min([np.nan, 1., 2., 3., 4.])
nan
>>> np.min([np.nan, 1.])
nan
>>> np.min([np.nan, 1., np.nan])
nan
>>> np.min([1., np.nan])
nan
>>> np.seterr(all='raise')
{'divide': 'warn', 'over': 'warn', 'under': 'ignore', 'invalid': 'warn'}
>>> np.min([1., np.nan])
nan
>>> np.min([np.nan, 1.])
nan
>>> np.min([np.nan, 1., 2., 3., 4.])
nan
>>> np.min([np.nan, 1., 2., 3., 4.])
nan
The context for these questions is the sudden CI fails I'm observing for
scipy on appveyor -
https://ci.appveyor.com/project/scipy/scipy/build/1.0.1444/job/n05ptntm0xxjklvt
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