int gsl_sf_airy_Bi_deriv_e(const double x, gsl_mode_t mode, gsl_sf_result * result) { /* CHECK_POINTER(result) */ if(x < -1.0) { gsl_sf_result a; gsl_sf_result p; int status_ap = airy_deriv_mod_phase(x, mode, &a, &p); double s = sin(p.val); result->val = a.val * s; result->err = fabs(result->val * p.err) + fabs(s * a.err); result->err += GSL_DBL_EPSILON * fabs(result->val); return status_ap; } else if(x < 1.0) { const double x3 = x*x*x; const double x2 = x*x; gsl_sf_result result_c1; gsl_sf_result result_c2; cheb_eval_mode_e(&bif_cs, x3, mode, &result_c1); cheb_eval_mode_e(&big_cs, x3, mode, &result_c2); result->val = x2 * (result_c1.val + 0.25) + result_c2.val + 0.5; result->err = x2 * result_c1.err + result_c2.err; result->err += GSL_DBL_EPSILON * fabs(result->val); return GSL_SUCCESS; } else if(x < 2.0) { const double z = (2.0*x*x*x - 9.0) / 7.0; gsl_sf_result result_c1; gsl_sf_result result_c2; cheb_eval_mode_e(&bif2_cs, z, mode, &result_c1); cheb_eval_mode_e(&big2_cs, z, mode, &result_c2); result->val = x*x * (result_c1.val + 0.25) + result_c2.val + 0.5; result->err = x*x * result_c1.err + result_c2.err; result->err += GSL_DBL_EPSILON * fabs(result->val); return GSL_SUCCESS; } else if(x < GSL_ROOT3_DBL_MAX*GSL_ROOT3_DBL_MAX) { gsl_sf_result result_bps; const double arg = 2.0*(x*sqrt(x)/3.0); int stat_b = gsl_sf_airy_Bi_deriv_scaled_e(x, mode, &result_bps); int stat_e = gsl_sf_exp_mult_err_e(arg, 1.5*fabs(arg*GSL_DBL_EPSILON), result_bps.val, result_bps.err, result); return GSL_ERROR_SELECT_2(stat_e, stat_b); } else { OVERFLOW_ERROR(result); } }
static VALUE Airy_Bi_deriv_scaled_e(VALUE self, VALUE x, VALUE mode) { int ret; gsl_sf_result r; ret = gsl_sf_airy_Bi_deriv_scaled_e(NUM2DBL(x), NUM2UINT(mode), &r); return RESULT(&r); }
double gsl_sf_airy_Bi_deriv_scaled(const double x, gsl_mode_t mode) { EVAL_RESULT(gsl_sf_airy_Bi_deriv_scaled_e(x, mode, &result)); }