numpy.ma.mr_ = <numpy.ma.extras.mr_class object> Translate slice objects to concatenation along the first axis.
This is the masked array version of lib.index_tricks.RClass.
See also
lib.index_tricks.RClass
>>> np.ma.mr_[np.ma.array([1,2,3]), 0, 0, np.ma.array([4,5,6])]
masked_array(data=[1, 2, 3, ..., 4, 5, 6],
mask=False,
fill_value=999999)
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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.ma.mr_.html