#NEWLINE# def plot_interval( self , parameter = 't' ) : #NEWLINE# #INDENT# "The plot interval for the default geometric plot of the Segment gives\n        values that will produce the full segment in a plot.\n\n        Parameters\n        ==========\n\n        parameter : str, optional\n            Default value is 't'.\n\n        Returns\n        =======\n\n        plot_interval : list\n            [parameter, lower_bound, upper_bound]\n\n        Examples\n        ========\n\n        >>> from sympy import Point3D, Segment3D\n        >>> p1, p2 = Point3D(0, 0, 0), Point3D(5, 3, 0)\n        >>> s1 = Segment3D(p1, p2)\n        >>> s1.plot_interval()\n        [t, 0, 1]\n\n        " #NEWLINE# t = _symbol ( parameter ) #NEWLINE# return [ t , 0 , 1 ]