

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


          | _C_a_l_l_i_n_g _I_n_f_o_r_m_a_t_i_o_n

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

          |      Library: vswtmath (Subsystem mathematical library)


          | _F_u_n_c_t_i_o_n

          |      This  function  returns  the sine of the angle whose measure
          |      (in radians) is given by the argument.  The  absolute  value
          |      of the argument must be less than 26353588.0.  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 return value will be zero.


          | _I_m_p_l_e_m_e_n_t_a_t_i_o_n

          |      The   function   is  implemented  as  a  minimax  polynomial
          |      approximation.  Note that for angles sufficiently small  the
          |      value  of  the  sine function is equal to the measure of the
          |      angle.   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

          |      dint$p, Primos signl$


          | _S_e_e _A_l_s_o

          |      dasn$m (2), dcos$m (2), dint$p (2), err$m (2), sin$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



















            dsin$m (2)                    - 1 -                    dsin$m (2)


