void acb_hypgeom_chebyshev_t(acb_t res, const acb_t n, const acb_t z, slong prec) { acb_t t; if (acb_is_int(n) && arf_cmpabs_2exp_si(arb_midref(acb_realref(n)), FLINT_BITS - 1) < 0) { slong k = arf_get_si(arb_midref(acb_realref(n)), ARF_RND_DOWN); acb_chebyshev_t_ui(res, FLINT_ABS(k), z, prec); return; } if (acb_is_zero(z)) { acb_mul_2exp_si(res, n, -1); acb_cos_pi(res, res, prec); return; } if (acb_is_one(z)) { acb_one(res); return; } acb_init(t); acb_set_si(t, -1); if (acb_equal(t, z)) { acb_cos_pi(res, n, prec); } else { acb_sub_ui(t, z, 1, prec); if (arf_cmpabs_2exp_si(arb_midref(acb_realref(t)), -2 - prec / 10) < 0 && arf_cmpabs_2exp_si(arb_midref(acb_imagref(t)), -2 - prec / 10) < 0) { acb_t a, c; acb_init(a); acb_init(c); acb_neg(a, n); acb_one(c); acb_mul_2exp_si(c, c, -1); acb_neg(t, t); acb_mul_2exp_si(t, t, -1); acb_hypgeom_2f1(res, a, n, c, t, 0, prec); acb_clear(a); acb_clear(c); } else if (arb_is_nonnegative(acb_realref(t))) { acb_acosh(t, z, prec); acb_mul(t, t, n, prec); acb_cosh(res, t, prec); } else { acb_acos(t, z, prec); acb_mul(t, t, n, prec); acb_cos(res, t, prec); } } acb_clear(t); }
int main() { slong iter; flint_rand_t state; flint_printf("integrate_taylor...."); fflush(stdout); flint_randinit(state); for (iter = 0; iter < 150 * arb_test_multiplier(); iter++) { acb_t ans, res, a, b; arf_t inr, outr; double t; slong goal, prec; acb_init(ans); acb_init(res); acb_init(a); acb_init(b); arf_init(inr); arf_init(outr); goal = 2 + n_randint(state, 300); prec = 2 + n_randint(state, 300); acb_randtest(a, state, 1 + n_randint(state, 200), 2); acb_randtest(b, state, 1 + n_randint(state, 200), 2); acb_cos(ans, a, prec); acb_cos(res, b, prec); acb_sub(ans, ans, res, prec); t = (1 + n_randint(state, 20)) / 10.0; arf_set_d(inr, t); arf_set_d(outr, t + (1 + n_randint(state, 20)) / 5.0); acb_calc_integrate_taylor(res, sin_x, NULL, a, b, inr, outr, goal, prec); if (!acb_overlaps(res, ans)) { flint_printf("FAIL! (iter = %wd)\n", iter); flint_printf("prec = %wd, goal = %wd\n", prec, goal); flint_printf("inr = "); arf_printd(inr, 15); flint_printf("\n"); flint_printf("outr = "); arf_printd(outr, 15); flint_printf("\n"); flint_printf("a = "); acb_printd(a, 15); flint_printf("\n"); flint_printf("b = "); acb_printd(b, 15); flint_printf("\n"); flint_printf("res = "); acb_printd(res, 15); flint_printf("\n\n"); flint_printf("ans = "); acb_printd(ans, 15); flint_printf("\n\n"); abort(); } acb_clear(ans); acb_clear(res); acb_clear(a); acb_clear(b); arf_clear(inr); arf_clear(outr); } flint_randclear(state); flint_cleanup(); flint_printf("PASS\n"); return EXIT_SUCCESS; }