numpy.ma.MaskedArray.__array_wrap__
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MaskedArray.__array_wrap__(obj, context=None)[source]
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Special hook for ufuncs. Wraps the numpy array and sets the mask according to context. 
    © 2008–2016 NumPy Developers
Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.ma.MaskedArray.__array_wrap__.html