dasn$m (2) --- calculate double precision inverse sine   04/27/83


          | _C_a_l_l_i_n_g _I_n_f_o_r_m_a_t_i_o_n

          |      longreal function dasn$m (x)
          |      longreal x

          |      Library: vswtmath (Subsystem mathematical library)


          | _F_u_n_c_t_i_o_n

          |      This  function calculates the inverse sine of an angle.  The
          |      argument to the function is the sine of the angle,  and  the
          |      function  returns  the  measure  of  the  angle, in radians.
          |      Arguments to the function must be  in  the  closed  interval
          |      [-1.0,  1.0].  The condition SWT_MATH_ERROR$ is signalled if
          |      there is an argument error.  An on-unit can  be  established
          |      to  deal  with  this  error; the SWT Math Library contains a
          |      default handler named 'err$m' which the  user  may  utilize.
          |      If  an  error  is  signalled,  the default function value is
          |      zero.


          | _I_m_p_l_e_m_e_n_t_a_t_i_o_n

          |      The  function  is  implemented   as   a   rational   minimax
          |      approximations  on a modified argument value.  It is adapted
          |      from the algorithm given in the book _S_o_f_t_w_a_r_e _M_a_n_u_a_l _f_o_r _t_h_e
          |      _E_l_e_m_e_n_t_a_r_y _F_u_n_c_t_i_o_n_s by William Waite and William Cody,  Jr.
          |      (Prentice-Hall, 1980).


          | _C_a_l_l_s

          |      dsqt$m, Primos signl$


          | _S_e_e _A_l_s_o

          |      asin$m (2), dsin$m (2), dsqt$m (2), err$m (2),
          |      _S_W_T _M_a_t_h _L_i_b_r_a_r_y _U_s_e_r_'_s _G_u_i_d_e


















            dasn$m (2)                    - 1 -                    dasn$m (2)