A1                 package:CircStats                 R Documentation

_R_a_t_i_o _o_f _F_i_r_s_t _a_n_d _Z_e_r_o_t_h _O_r_d_e_r _B_e_s_s_e_l _F_u_n_c_t_i_o_n_s

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

     Evaluates the first and zeroth order Bessel functions of the first
     kind at a specified non-negative real number, and returns the
     ratio.

_U_s_a_g_e:

     A1(kappa)

_A_r_g_u_m_e_n_t_s:

   kappa: non-negative numeric value at which to evaluate the Bessel
          functions.

_D_e_t_a_i_l_s:

     The function use `besselI'.

_V_a_l_u_e:

     If I1(kappa) is the first order Bessel function and I0(kappa) is
     the zeroth order Bessel function, then A1(kappa) returns
     I1(kappa)/I0(kappa).

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

     `besselI', `A1inv'.

