def METHOD_NAME(self):
    """Allows to connect coordinate_system input to the operator.
    3-3 rotation matrix
    Parameters
    ----------
    my_coordinate_system : Field
    Examples
    --------
    >>> from ansys.dpf import core as dpf
    >>> op = dpf.operators.geo.rotate_fc()
    >>> op.inputs.coordinate_system.connect(my_coordinate_system)
    >>> # or
    >>> op.inputs.coordinate_system(my_coordinate_system)
    """
    return self._coordinate_system