trigammaInverse            package:limma            R Documentation

_I_n_v_e_r_s_e _T_r_i_g_a_m_m_a _F_u_n_c_t_i_o_n

_D_e_s_c_r_i_p_t_i_o_n:

     The inverse of the trigamma function.

_U_s_a_g_e:

     trigammaInverse(x)

_A_r_g_u_m_e_n_t_s:

       x: numeric vector or array

_D_e_t_a_i_l_s:

     The function uses Newton's method with a clever starting value to
     ensure monotonic convergence.

_V_a_l_u_e:

     Numeric vector or array 'y' satisfying 'trigamma(y)==x'.

_N_o_t_e:

     This function does not accept a data.frame as argument although
     the internal function 'trigamma' does.

_A_u_t_h_o_r(_s):

     Gordon Smyth

_S_e_e _A_l_s_o:

     'trigamma'

_E_x_a_m_p_l_e_s:

     y <- trigammaInverse(5)
     trigamma(y)