dexp$m (2) --- calculate double precision exponential to the base e 04/27/83 | _C_a_l_l_i_n_g _I_n_f_o_r_m_a_t_i_o_n | longreal function dexp$m (x) | longreal x | Library: vswtmath (Subsystem mathematical library) | _F_u_n_c_t_i_o_n | This function raises the constant eee to the power of the | argument. Arguments to the function must be in the closed | interval [-22802.46279888, 22623.630826296]. 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$m' | which the user may utilize. If an error is signalled, the | default function return value is zero. | It should be noted that the function could simply return | zero for sufficiently small arguments rather than signalling | an error since the actual function value would be | indistinguishable from zero to the precision of the machine. | However, there is no mapping to zero in the actual function, | and that is why the function signals an error in this case. | _I_m_p_l_e_m_e_n_t_a_t_i_o_n | The routine is implemented as a functional approximation | performed on a reduction of the argument. It is adapted | from the algorithm given in the book _S_o_f_t_w_a_r_e _M_a_n_u_a_l _f_o_r _t_h_e | _E_l_e_m_e_n_t_a_r_y _F_u_n_c_t_i_o_n_s by William Waite and William Cody, Jr. | (Prentice-Hall, 1980). | _C_a_l_l_s | Primos signl$ | _S_e_e _A_l_s_o | err$m (2), exp$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 dexp$m (2) - 1 - dexp$m (2)