code: def Indicator(pos, size, dtype):
    
    x = numpy.zeros(size, dtype=dtype)
    x[pos] = 1
    return x
docs: Returns an array of length size and type dtype that is everywhere 0,
    except in the index in pos.
  
    :param pos: (int) specifies the position of the one entry that will be set.
    :param size: (int) The total size of the array to be returned.
    :param dtype: The element type (compatible with NumPy array())
           of the array to be returned.
    :returns: (list) of length ``size`` and element type ``dtype``.