NotYet package:base R Documentation _N_o_t _Y_e_t _I_m_p_l_e_m_e_n_t_e_d _F_u_n_c_t_i_o_n_s _a_n_d _U_n_u_s_e_d _A_r_g_u_m_e_n_t_s _D_e_s_c_r_i_p_t_i_o_n: In order to pinpoint missing functionality, the R core team uses these functions for missing R functions and not yet used arguments of existing R functions (which are typically there for compatibility purposes). You are very welcome to contribute your code ... _U_s_a_g_e: .NotYetImplemented() .NotYetUsed(arg, error = TRUE) _A_r_g_u_m_e_n_t_s: arg: an argument of a function that is not yet used. error: a logical. If 'TRUE', an error is signalled; if 'FALSE'; only a warning is given. _S_e_e _A_l_s_o: the contrary, 'Deprecated' and 'Defunct' for outdated code. _E_x_a_m_p_l_e_s: require(graphics) require(stats) plot.mlm # to see how the "NotYetImplemented" # reference is made automagically try(plot.mlm()) barplot(1:5, inside = TRUE) # 'inside' is not yet used