def change_eigen_param(self, param_name, new_value):
    """
    Used to change a param in eigen params area.
    Parameters
    ----------
    param_name : str
        name of parameter to change
    new_value : ?
        the new value to the parameter

    Returns
    -------
    True if successful
    """
    if param_name in self.eigen_params:
        self.eigen_params[param_name] = new_value
        self.global_params["need_recalc_eigen_params"] = True
        # self.save_new_param_json()
        return True
    else:
        return False