r"""Change the length of a certain parameter to a certain value.

        Args
        ----
        parameter: str
            The name of the parameter to change the length for
        value: str
            The value to set the parameter to

def change_length(self, parameter, value):
        r"""Change the length of a certain parameter to a certain value.

        Args
        ----
        parameter: str
            The name of the parameter to change the length for
        value: str
            The value to set the parameter to
        """

        self.preamble.append(UnsafeCommand('setlength',
                                           arguments=[parameter, value]))