Method get_link_axis_function

! Get function for computing the link axis. @param link Name of the end-effector link. @param axis The axis (direction vector) defined in the end-effector frame. If 'x', 'y', 'z' is passed then the corresponding sub-array of the homogenous transform is used. @param base_link

(
        self,
        link: str,
        axis: Union[str, ArrayType],
        base_link: str,
        n: int = 1,
        numpy_output: bool = False,
    )