

_W_a_r_n_i_n_g _M_e_s_s_a_g_e_s

     warning(message)

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

     `warning' generates a warning message that corresponds
     to its argument. The result depends on the value of
     `options("warn")'.  If `warn' is negative warnings are
     ignored; if it is zero they are stored and printed
     after the toplevel function has completed; if it is one
     they are printed as they occur and if it is 2 (or
     larger) warnings are turned into errors.  If `warn' is
     zero a toplevel variable `last.warning' is created. It
     contains the warnings which can be printed via a call
     to `warnings'.

_E_x_a_m_p_l_e_s:

     if(eigenval < 1.e-7) warning("system near singular")

     if(eigenval < 1.e-7) warning("system near singular")

