

_P_a_r_e_n_t_h_e_s_e_s _a_n_d _B_r_a_c_e_s

     ( ... )

     { ... }

_D_e_s_c_r_i_p_t_i_o_n:

     Open parenthesis, `(', and open brace, `{', are `.Prim-
     itive' functions in R.

     Effectively, `(' is semantically equivalent to the
     identity `function(x) x', whereas `{' is slightly more
     interesting, see examples.

_S_e_e _A_l_s_o:

     `if', `return', etc for other objects used in the R
     language itself.

