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numpy.ma.mr_
- 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.RClassExamples>>> 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://numpy.org/doc/1.19/reference/generated/numpy.ma.mr_.html