void _acb_poly_binomial_transform_basecase(acb_ptr b, acb_srcptr a, slong alen, slong len, slong prec) { slong n, k; fmpz_t t; fmpz_init(t); for (n = 0; n < len; n++) { acb_zero(b + n); for (k = 0; k < FLINT_MIN(n + 1, alen); k++) { if (k == 0) { fmpz_one(t); } else { fmpz_mul_si(t, t, -(n - k + 1)); fmpz_divexact_ui(t, t, k); } acb_addmul_fmpz(b + n, a + k, t, prec); } } fmpz_clear(t); }
void acb_rising2_ui_rs(acb_t u, acb_t v, const acb_t x, ulong n, ulong m, long prec) { if (n == 0) { acb_zero(v); acb_one(u); } else if (n == 1) { acb_set(u, x); acb_one(v); } else { long wp; ulong i, j, a, b; acb_ptr xs; acb_t S, T, U, V; fmpz *A, *B; wp = ARF_PREC_ADD(prec, FLINT_BIT_COUNT(n)); if (m == 0) { ulong m1, m2; m1 = 0.6 * pow(wp, 0.4); m2 = n_sqrt(n); m = FLINT_MIN(m1, m2); } m = FLINT_MAX(m, 1); xs = _acb_vec_init(m + 1); A = _fmpz_vec_init(2 * m + 1); B = A + (m + 1); acb_init(S); acb_init(T); acb_init(U); acb_init(V); _acb_vec_set_powers(xs, x, m + 1, wp); for (i = 0; i < n; i += m) { a = i; b = FLINT_MIN(n, a + m); if (a == 0 || b != a + m) { _gamma_rf_bsplit(A, a, b); } else { fmpz tt = m; _fmpz_poly_taylor_shift(A, &tt, m + 1); } _fmpz_poly_derivative(B, A, b - a + 1); acb_set_fmpz(S, A); for (j = 1; j <= b - a; j++) acb_addmul_fmpz(S, xs + j, A + j, wp); acb_set_fmpz(T, B); for (j = 1; j < b - a; j++) acb_addmul_fmpz(T, xs + j, B + j, wp); if (i == 0) { acb_set(U, S); acb_set(V, T); } else { acb_mul(V, V, S, wp); acb_addmul(V, U, T, wp); acb_mul(U, U, S, wp); } } acb_set(u, U); acb_set(v, V); _acb_vec_clear(xs, m + 1); _fmpz_vec_clear(A, 2 * m + 1); acb_clear(S); acb_clear(T); acb_clear(U); acb_clear(V); } }
int main() { slong iter; flint_rand_t state; flint_printf("quadratic_roots_fmpz...."); fflush(stdout); flint_randinit(state); for (iter = 0; iter < 10000 * arb_test_multiplier(); iter++) { acb_t r1, r2, x, y; fmpz_t a, b, c; slong prec; fmpz_init(a); fmpz_init(b); fmpz_init(c); acb_init(r1); acb_init(r2); acb_init(x); acb_init(y); prec = 2 + n_randint(state, 1000); fmpz_randtest_not_zero(a, state, 1 + n_randint(state, 1000)); fmpz_randtest(b, state, 1 + n_randint(state, 1000)); fmpz_randtest(c, state, 1 + n_randint(state, 1000)); acb_randtest(r1, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 100)); acb_randtest(r2, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 100)); acb_quadratic_roots_fmpz(r1, r2, a, b, c, prec); acb_mul(x, r1, r1, prec); acb_mul_fmpz(x, x, a, prec); acb_addmul_fmpz(x, r1, b, prec); acb_add_fmpz(x, x, c, prec); acb_mul(y, r2, r2, prec); acb_mul_fmpz(y, y, a, prec); acb_addmul_fmpz(y, r2, b, prec); acb_add_fmpz(y, y, c, prec); if (!acb_contains_zero(x) || !acb_contains_zero(y) || acb_rel_accuracy_bits(r1) < prec - 4 || acb_rel_accuracy_bits(r2) < prec - 4) { flint_printf("FAIL: containment / accuracy\n\n"); flint_printf("prec = %wd\n", prec); flint_printf("a = "); fmpz_print(a); flint_printf("\n\n"); flint_printf("b = "); fmpz_print(b); flint_printf("\n\n"); flint_printf("c = "); fmpz_print(c); flint_printf("\n\n"); flint_printf("r1 = "); acb_printd(r1, 30); flint_printf("\n\n"); flint_printf("r2 = "); acb_printd(r2, 30); flint_printf("\n\n"); abort(); } fmpz_clear(a); fmpz_clear(b); fmpz_clear(c); acb_clear(r1); acb_clear(r2); acb_clear(x); acb_clear(y); } flint_randclear(state); flint_cleanup(); flint_printf("PASS\n"); return EXIT_SUCCESS; }
void acb_modular_transform(acb_t w, const psl2z_t g, const acb_t z, slong prec) { #define a (&g->a) #define b (&g->b) #define c (&g->c) #define d (&g->d) #define x acb_realref(z) #define y acb_imagref(z) if (fmpz_is_zero(c)) { /* (az+b)/d, where we must have a = d = 1 */ acb_add_fmpz(w, z, b, prec); } else if (fmpz_is_zero(a)) { /* b/(cz+d), where -bc = 1, c = 1 => -1/(z+d) */ acb_add_fmpz(w, z, d, prec); acb_inv(w, w, prec); acb_neg(w, w); } else if (0) { acb_t t, u; acb_init(t); acb_init(u); acb_set_fmpz(t, b); acb_addmul_fmpz(t, z, a, prec); acb_set_fmpz(u, d); acb_addmul_fmpz(u, z, c, prec); acb_div(w, t, u, prec); acb_clear(t); acb_clear(u); } else { /* (az+b)/(cz+d) = (re+im*i)/den where re = bd + (bc+ad)x + ac(x^2+y^2) im = (ad-bc)y den = c^2(x^2+y^2) + 2cdx + d^2 */ fmpz_t t; arb_t re, im, den; arb_init(re); arb_init(im); arb_init(den); fmpz_init(t); arb_mul(im, x, x, prec); arb_addmul(im, y, y, prec); fmpz_mul(t, b, d); arb_set_fmpz(re, t); fmpz_mul(t, b, c); fmpz_addmul(t, a, d); arb_addmul_fmpz(re, x, t, prec); fmpz_mul(t, a, c); arb_addmul_fmpz(re, im, t, prec); fmpz_mul(t, d, d); arb_set_fmpz(den, t); fmpz_mul(t, c, d); fmpz_mul_2exp(t, t, 1); arb_addmul_fmpz(den, x, t, prec); fmpz_mul(t, c, c); arb_addmul_fmpz(den, im, t, prec); fmpz_mul(t, a, d); fmpz_submul(t, b, c); arb_mul_fmpz(im, y, t, prec); arb_div(acb_realref(w), re, den, prec); arb_div(acb_imagref(w), im, den, prec); arb_clear(re); arb_clear(im); arb_clear(den); fmpz_clear(t); } #undef a #undef b #undef c #undef d #undef x #undef y }
void acb_rising_ui_rs(acb_t y, const acb_t x, ulong n, ulong m, slong prec) { acb_ptr xs; acb_t t, u, v; ulong i, k, rem; fmpz_t c, h; fmpz *s, *d; slong wp; if (n == 0) { acb_one(y); return; } if (n == 1) { acb_set_round(y, x, prec); return; } wp = ARF_PREC_ADD(prec, FLINT_BIT_COUNT(n)); acb_init(t); acb_init(u); acb_init(v); fmpz_init(c); fmpz_init(h); if (m == 0) { ulong m1, m2; m1 = 0.2 * pow(2.0 * wp, 0.4); m2 = n_sqrt(n); m = FLINT_MIN(m1, m2); } m = FLINT_MIN(m, n); m = FLINT_MAX(m, 1); xs = _acb_vec_init(m + 1); d = _fmpz_vec_init(m * m); s = _fmpz_vec_init(m + 1); _acb_vec_set_powers(xs, x, m + 1, wp); rising_difference_polynomial(s, d, m); /* tail */ rem = m; while (rem + m <= n) rem += m; acb_one(y); for (k = rem; k < n; k++) { acb_add_ui(t, xs + 1, k, wp); acb_mul(y, y, t, wp); } /* initial rising factorial */ acb_zero(t); for (i = 1; i <= m; i++) acb_addmul_fmpz(t, xs + i, s + i, wp); acb_mul(y, y, t, wp); /* the leading coefficient is always the same */ acb_mul_fmpz(xs + m - 1, xs + m - 1, d + m - 1 + 0, wp); for (k = 0; k + 2 * m <= n; k += m) { for (i = 0; i < m - 1; i++) { fmpz_set_ui(h, k); _fmpz_poly_evaluate_horner_fmpz(c, d + i * m, m - i, h); if (i == 0) acb_add_fmpz(t, t, c, wp); else acb_addmul_fmpz(t, xs + i, c, wp); } acb_add(t, t, xs + m - 1, wp); acb_mul(y, y, t, wp); } acb_set_round(y, y, prec); acb_clear(t); acb_clear(u); acb_clear(v); _acb_vec_clear(xs, m + 1); _fmpz_vec_clear(d, m * m); _fmpz_vec_clear(s, m + 1); fmpz_clear(c); fmpz_clear(h); }