#NEWLINE# def make_cylindrical( self , grid , axis = 'z' ) : #NEWLINE# #INDENT# "\n        Convert to cylindrical coordinate system.\n\n        grid: :class:`GridCoordinates`\n            Must be in cylindrical form.\n\n        axis: string\n            Specifies which is the cylinder axis ('z' or 'x').\n        " #NEWLINE# for vector in self . _vectors : #NEWLINE# #INDENT# vector . make_cylindrical ( grid , vector )