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("rising2_ui....");
fflush(stdout);
flint_randinit(state);
for (iter = 0; iter < 1000; iter++)
{
acb_t a, u, v, u2, v2;
fmpz *f;
acb_ptr g;
ulong n;
slong i, prec;
acb_init(a);
acb_init(u);
acb_init(v);
acb_init(u2);
acb_init(v2);
acb_randtest(a, state, 1 + n_randint(state, 4000), 10);
acb_randtest(u, state, 1 + n_randint(state, 4000), 10);
acb_randtest(v, state, 1 + n_randint(state, 4000), 10);
n = n_randint(state, 120);
f = _fmpz_vec_init(n + 1);
g = _acb_vec_init(n + 1);
prec = 2 + n_randint(state, 4000);
acb_rising2_ui(u, v, a, n, prec);
arith_stirling_number_1u_vec(f, n, n + 1);
for (i = 0; i <= n; i++)
acb_set_fmpz(g + i, f + i);
_acb_poly_evaluate(u2, g, n + 1, a, prec);
_acb_poly_derivative(g, g, n + 1, prec);
_acb_poly_evaluate(v2, g, n, a, prec);
if (!acb_overlaps(u, u2) || !acb_overlaps(v, v2))
{
flint_printf("FAIL: overlap\n\n");
flint_printf("n = %wu\n", n);
flint_printf("a = "); acb_printd(a, 15); flint_printf("\n\n");
flint_printf("u = "); acb_printd(u, 15); flint_printf("\n\n");
flint_printf("u2 = "); acb_printd(u2, 15); flint_printf("\n\n");
flint_printf("v = "); acb_printd(v, 15); flint_printf("\n\n");
flint_printf("v2 = "); acb_printd(v2, 15); flint_printf("\n\n");
abort();
}
acb_set(u2, a);
acb_rising2_ui(u2, v, u2, n, prec);
if (!acb_equal(u2, u))
{
flint_printf("FAIL: aliasing 1\n\n");
flint_printf("a = "); acb_printd(a, 15); flint_printf("\n\n");
flint_printf("u = "); acb_printd(u, 15); flint_printf("\n\n");
flint_printf("u2 = "); acb_printd(u2, 15); flint_printf("\n\n");
flint_printf("n = %wu\n", n);
abort();
}
acb_set(v2, a);
acb_rising2_ui(u, v2, v2, n, prec);
if (!acb_equal(v2, v))
{
flint_printf("FAIL: aliasing 2\n\n");
flint_printf("a = "); acb_printd(a, 15); flint_printf("\n\n");
flint_printf("v = "); acb_printd(v, 15); flint_printf("\n\n");
flint_printf("v2 = "); acb_printd(v2, 15); flint_printf("\n\n");
flint_printf("n = %wu\n", n);
abort();
}
acb_clear(a);
acb_clear(u);
acb_clear(v);
acb_clear(u2);
acb_clear(v2);
_fmpz_vec_clear(f, n + 1);
_acb_vec_clear(g, n + 1);
}
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
}
