void
acb_hypgeom_erfi(acb_t res, const acb_t z, slong prec)
{
acb_mul_onei(res, z);
acb_hypgeom_erf(res, res, prec);
acb_mul_onei(res, res);
acb_neg(res, res);
}
void
acb_hypgeom_bessel_jy(acb_t res1, acb_t res2, const acb_t nu, const acb_t z, slong prec)
{
acb_t jnu, t, u, v;
acb_init(jnu);
acb_init(t);
acb_init(u);
acb_init(v);
acb_hypgeom_bessel_j(jnu, nu, z, prec);
if (acb_is_int(nu))
{
int is_real = acb_is_real(nu) && acb_is_real(z)
&& arb_is_positive(acb_realref(z));
acb_mul_onei(t, z);
acb_hypgeom_bessel_k(t, nu, t, prec);
acb_onei(u);
acb_pow(u, u, nu, prec);
acb_mul(t, t, u, prec);
acb_const_pi(u, prec);
acb_div(t, t, u, prec);
acb_mul_2exp_si(t, t, 1);
acb_neg(t, t);
phase(v, acb_realref(z), acb_imagref(z));
acb_mul(u, jnu, v, prec);
acb_mul_onei(u, u);
acb_sub(res2, t, u, prec);
if (is_real)
arb_zero(acb_imagref(res2));
}
else
{
acb_sin_cos_pi(t, u, nu, prec);
acb_mul(v, jnu, u, prec);
acb_neg(u, nu);
acb_hypgeom_bessel_j(u, u, z, prec);
acb_sub(v, v, u, prec);
acb_div(res2, v, t, prec);
}
if (res1 != NULL)
acb_set(res1, jnu);
acb_clear(jnu);
acb_clear(t);
acb_clear(u);
acb_clear(v);
}
void
acb_cot(acb_t r, const acb_t z, slong prec)
{
if (arb_is_zero(acb_imagref(z)))
{
arb_cot(acb_realref(r), acb_realref(z), prec);
arb_zero(acb_imagref(r));
}
else if (arb_is_zero(acb_realref(z)))
{
arb_coth(acb_imagref(r), acb_imagref(z), prec);
arb_neg(acb_imagref(r), acb_imagref(r));
arb_zero(acb_realref(r));
}
else
{
acb_t t;
acb_init(t);
if (arf_cmpabs_2exp_si(arb_midref(acb_imagref(z)), 0) < 0)
{
acb_sin_cos(r, t, z, prec + 4);
acb_div(r, t, r, prec);
}
else
{
acb_mul_2exp_si(t, z, 1);
if (arf_sgn(arb_midref(acb_imagref(z))) > 0)
{
acb_mul_onei(t, t);
acb_exp(t, t, prec + 4);
acb_sub_ui(r, t, 1, prec + 4);
acb_div(r, t, r, prec + 4);
acb_mul_2exp_si(r, r, 1);
acb_sub_ui(r, r, 1, prec);
acb_mul_onei(r, r);
}
else
{
acb_div_onei(t, t);
acb_exp(t, t, prec + 4);
acb_sub_ui(r, t, 1, prec + 4);
acb_div(r, t, r, prec + 4);
acb_mul_2exp_si(r, r, 1);
acb_sub_ui(r, r, 1, prec);
acb_div_onei(r, r);
}
}
acb_clear(t);
}
}
void
acb_hypgeom_bessel_i_asymp_prefactors(acb_t A, acb_t B, acb_t C,
const acb_t nu, const acb_t z, long prec)
{
acb_t t, u;
acb_init(t);
acb_init(u);
/* C = (2 pi z)^(-1/2) */
acb_const_pi(C, prec);
acb_mul_2exp_si(C, C, 1);
acb_mul(C, C, z, prec);
acb_rsqrt(C, C, prec);
if (arb_is_positive(acb_imagref(z)) ||
(arb_is_zero(acb_imagref(z)) && arb_is_negative(acb_realref(z))))
{
acb_exp_pi_i(t, nu, prec);
acb_mul_onei(t, t);
}
else if (arb_is_negative(acb_imagref(z)) ||
(arb_is_zero(acb_imagref(z)) && arb_is_positive(acb_realref(z))))
{
acb_neg(t, nu);
acb_exp_pi_i(t, t, prec);
acb_mul_onei(t, t);
acb_neg(t, t);
}
else
{
acb_exp_pi_i(t, nu, prec);
acb_mul_onei(t, t);
acb_neg(u, nu);
acb_exp_pi_i(u, u, prec);
acb_mul_onei(u, u);
acb_neg(u, u);
arb_union(acb_realref(t), acb_realref(t), acb_realref(u), prec);
arb_union(acb_imagref(t), acb_imagref(t), acb_imagref(u), prec);
}
acb_exp_invexp(B, A, z, prec);
acb_mul(A, A, t, prec);
acb_clear(t);
acb_clear(u);
}
void
acb_lambertw_initial_asymp(acb_t w, const acb_t z, const fmpz_t k, slong prec)
{
acb_t L1, L2, t;
acb_init(L1);
acb_init(L2);
acb_init(t);
acb_const_pi(L2, prec);
acb_mul_2exp_si(L2, L2, 1);
acb_mul_fmpz(L2, L2, k, prec);
acb_mul_onei(L2, L2);
acb_log(L1, z, prec);
acb_add(L1, L1, L2, prec);
acb_log(L2, L1, prec);
/* L1 - L2 + L2/L1 + L2(L2-2)/(2 L1^2) */
acb_inv(t, L1, prec);
acb_mul_2exp_si(w, L2, 1);
acb_submul(w, L2, L2, prec);
acb_neg(w, w);
acb_mul(w, w, t, prec);
acb_mul_2exp_si(w, w, -1);
acb_add(w, w, L2, prec);
acb_mul(w, w, t, prec);
acb_sub(w, w, L2, prec);
acb_add(w, w, L1, prec);
acb_clear(L1);
acb_clear(L2);
acb_clear(t);
}
void
acb_atanh(acb_t res, const acb_t z, slong prec)
{
acb_mul_onei(res, z);
acb_atan(res, res, prec);
acb_div_onei(res, res);
}
void
acb_hypgeom_bessel_j_asymp_prefactors(acb_t Ap, acb_t Am, acb_t C,
const acb_t nu, const acb_t z, long prec)
{
if (arb_is_positive(acb_realref(z)))
{
acb_t t, u;
acb_init(t);
acb_init(u);
/* -(2nu+1)/4 * pi + z */
acb_mul_2exp_si(t, nu, 1);
acb_add_ui(t, t, 1, prec);
acb_mul_2exp_si(t, t, -2);
acb_neg(t, t);
acb_const_pi(u, prec);
acb_mul(t, t, u, prec);
acb_add(t, t, z, prec);
acb_mul_onei(t, t);
acb_exp_invexp(Ap, Am, t, prec);
/* (2 pi z)^(-1/2) */
acb_const_pi(C, prec);
acb_mul_2exp_si(C, C, 1);
acb_mul(C, C, z, prec);
acb_rsqrt(C, C, prec);
acb_clear(t);
acb_clear(u);
return;
}
acb_hypgeom_bessel_j_asymp_prefactors_fallback(Ap, Am, C, nu, z, prec);
}
void
acb_mul(acb_t z, const acb_t x, const acb_t y, slong prec)
{
if (arb_is_zero(b))
{
arb_mul(f, d, a, prec);
arb_mul(e, c, a, prec);
}
else if (arb_is_zero(d))
{
arb_mul(f, b, c, prec);
arb_mul(e, a, c, prec);
}
else if (arb_is_zero(a))
{
arb_mul(e, c, b, prec);
arb_mul(f, d, b, prec);
acb_mul_onei(z, z);
}
else if (arb_is_zero(c))
{
arb_mul(e, a, d, prec);
arb_mul(f, b, d, prec);
acb_mul_onei(z, z);
}
/* squaring = a^2-b^2, 2ab */
else if (x == y)
{
if (ARB_IS_LAGOM(a) && ARB_IS_LAGOM(b))
_acb_sqr_fast(z, x, prec);
else
_acb_sqr_slow(z, x, prec);
}
else
{
if (ARB_IS_LAGOM(a) && ARB_IS_LAGOM(b) &&
ARB_IS_LAGOM(c) && ARB_IS_LAGOM(d))
_acb_mul_fast(z, x, y, prec);
else
_acb_mul_slow(z, x, y, prec);
}
}
/* f(z) = exp(-z^2+iz) */
int
f_gaussian_twist(acb_ptr res, const acb_t z, void * param, slong order, slong prec)
{
if (order > 1)
flint_abort(); /* Would be needed for Taylor method. */
acb_mul_onei(res, z);
acb_submul(res, z, z, prec);
acb_exp(res, res, prec);
return 0;
}
/* (+/- iz)^(-1/2-v) * z^v * exp(+/- iz) */
void
acb_hypgeom_bessel_j_asymp_prefactors_fallback(acb_t Ap, acb_t Am, acb_t C,
const acb_t nu, const acb_t z, long prec)
{
acb_t t, u, v;
acb_init(t);
acb_init(u);
acb_init(v);
/* v = -1/2-nu */
acb_one(v);
acb_mul_2exp_si(v, v, -1);
acb_add(v, v, nu, prec);
acb_neg(v, v);
acb_mul_onei(t, z); /* t = iz */
acb_neg(u, t); /* u = -iz */
/* Ap, Am = (+/- iz)^(-1/2-nu) */
acb_pow(Ap, t, v, prec);
acb_pow(Am, u, v, prec);
/* Ap, Am *= exp(+/- iz) */
acb_exp_invexp(u, v, t, prec);
acb_mul(Ap, Ap, u, prec);
acb_mul(Am, Am, v, prec);
/* z^nu */
acb_pow(t, z, nu, prec);
acb_mul(Ap, Ap, t, prec);
acb_mul(Am, Am, t, prec);
/* (2 pi)^(-1/2) */
acb_const_pi(C, prec);
acb_mul_2exp_si(C, C, 1);
acb_rsqrt(C, C, prec);
acb_clear(t);
acb_clear(u);
acb_clear(v);
}
int main()
{
slong iter;
flint_rand_t state;
flint_printf("bessel_i....");
fflush(stdout);
flint_randinit(state);
for (iter = 0; iter < 2000; iter++)
{
acb_t nu, z, jv, iv, t;
slong prec;
acb_init(nu);
acb_init(z);
acb_init(jv);
acb_init(iv);
acb_init(t);
prec = 2 + n_randint(state, 500);
acb_randtest_param(nu, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 10));
acb_randtest(z, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 100));
switch (n_randint(state, 3))
{
case 0:
acb_hypgeom_bessel_i_asymp(iv, nu, z, prec);
break;
case 1:
acb_hypgeom_bessel_i_0f1(iv, nu, z, prec);
break;
default:
acb_hypgeom_bessel_i(iv, nu, z, prec);
}
acb_mul_onei(t, z);
acb_hypgeom_bessel_j(jv, nu, t, prec);
acb_pow(t, z, nu, prec);
acb_mul(jv, jv, t, prec);
acb_mul_onei(t, z);
acb_pow(t, t, nu, prec);
acb_div(jv, jv, t, prec);
if (!acb_overlaps(iv, jv))
{
flint_printf("FAIL: consistency with bessel_j\n\n");
flint_printf("nu = "); acb_printd(nu, 30); flint_printf("\n\n");
flint_printf("z = "); acb_printd(z, 30); flint_printf("\n\n");
flint_printf("iv = "); acb_printd(iv, 30); flint_printf("\n\n");
flint_printf("jv = "); acb_printd(jv, 30); flint_printf("\n\n");
abort();
}
acb_clear(nu);
acb_clear(z);
acb_clear(jv);
acb_clear(iv);
acb_clear(t);
}
for (iter = 0; iter < 2000; iter++)
{
acb_t nu0, nu1, nu2, z, w0, w1, w2, t, u;
slong prec0, prec1, prec2;
acb_init(nu0);
acb_init(nu1);
acb_init(nu2);
acb_init(z);
acb_init(w0);
acb_init(w1);
acb_init(w2);
acb_init(t);
acb_init(u);
prec0 = 2 + n_randint(state, 1000);
prec1 = 2 + n_randint(state, 1000);
prec2 = 2 + n_randint(state, 1000);
acb_randtest_param(nu0, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 100));
acb_randtest(z, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 100));
acb_randtest(w0, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 100));
acb_randtest(w1, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 100));
acb_randtest(w2, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 100));
acb_sub_ui(nu1, nu0, 1, prec0);
acb_sub_ui(nu2, nu0, 2, prec0);
switch (n_randint(state, 3))
{
case 0:
acb_hypgeom_bessel_i_asymp(w0, nu0, z, prec0);
break;
case 1:
acb_hypgeom_bessel_i_0f1(w0, nu0, z, prec0);
break;
default:
acb_hypgeom_bessel_i(w0, nu0, z, prec0);
}
switch (n_randint(state, 3))
{
case 0:
acb_hypgeom_bessel_i_asymp(w1, nu0, z, prec1);
break;
case 1:
acb_hypgeom_bessel_i_0f1(w1, nu0, z, prec1);
break;
default:
acb_hypgeom_bessel_i(w1, nu0, z, prec1);
}
if (!acb_overlaps(w0, w1))
{
flint_printf("FAIL: consistency\n\n");
flint_printf("nu = "); acb_printd(nu0, 30); flint_printf("\n\n");
flint_printf("z = "); acb_printd(z, 30); flint_printf("\n\n");
flint_printf("w0 = "); acb_printd(w0, 30); flint_printf("\n\n");
flint_printf("w1 = "); acb_printd(w1, 30); flint_printf("\n\n");
abort();
}
switch (n_randint(state, 3))
{
case 0:
acb_hypgeom_bessel_i_asymp(w1, nu1, z, prec1);
break;
case 1:
acb_hypgeom_bessel_i_0f1(w1, nu1, z, prec1);
break;
default:
acb_hypgeom_bessel_i(w1, nu1, z, prec1);
}
switch (n_randint(state, 3))
{
case 0:
acb_hypgeom_bessel_i_asymp(w2, nu2, z, prec2);
break;
case 1:
acb_hypgeom_bessel_i_0f1(w2, nu2, z, prec2);
break;
default:
acb_hypgeom_bessel_i(w2, nu2, z, prec2);
}
acb_mul(t, w1, nu1, prec0);
acb_mul_2exp_si(t, t, 1);
acb_submul(t, w2, z, prec0);
acb_addmul(t, w0, z, prec0);
if (!acb_contains_zero(t))
{
flint_printf("FAIL: contiguous relation\n\n");
flint_printf("nu = "); acb_printd(nu0, 30); flint_printf("\n\n");
flint_printf("z = "); acb_printd(z, 30); flint_printf("\n\n");
flint_printf("w0 = "); acb_printd(w0, 30); flint_printf("\n\n");
flint_printf("w1 = "); acb_printd(w1, 30); flint_printf("\n\n");
flint_printf("w2 = "); acb_printd(w2, 30); flint_printf("\n\n");
flint_printf("t = "); acb_printd(t, 30); flint_printf("\n\n");
abort();
}
acb_neg(t, nu0);
switch (n_randint(state, 3))
{
case 0:
acb_hypgeom_bessel_i_asymp(w2, t, z, prec2);
break;
case 1:
acb_hypgeom_bessel_i_0f1(w2, t, z, prec2);
break;
default:
acb_hypgeom_bessel_i(w2, t, z, prec2);
}
acb_mul(w1, w1, w2, prec2);
acb_neg(t, nu1);
switch (n_randint(state, 3))
{
case 0:
acb_hypgeom_bessel_i_asymp(w2, t, z, prec2);
break;
case 1:
acb_hypgeom_bessel_i_0f1(w2, t, z, prec2);
break;
default:
acb_hypgeom_bessel_i(w2, t, z, prec2);
}
acb_mul(w0, w0, w2, prec2);
acb_sub(w0, w1, w0, prec2);
acb_sin_pi(t, nu0, prec2);
acb_const_pi(u, prec2);
acb_mul(u, u, z, prec2);
acb_div(t, t, u, prec2);
acb_mul_2exp_si(t, t, 1);
if (!acb_overlaps(w0, t))
{
flint_printf("FAIL: wronskian\n\n");
flint_printf("nu = "); acb_printd(nu0, 30); flint_printf("\n\n");
flint_printf("z = "); acb_printd(z, 30); flint_printf("\n\n");
flint_printf("w0 = "); acb_printd(w0, 30); flint_printf("\n\n");
flint_printf("t = "); acb_printd(t, 30); flint_printf("\n\n");
abort();
}
acb_clear(nu0);
acb_clear(nu1);
acb_clear(nu2);
acb_clear(z);
acb_clear(w0);
acb_clear(w1);
acb_clear(w2);
acb_clear(t);
acb_clear(u);
}
flint_randclear(state);
flint_cleanup();
flint_printf("PASS\n");
return EXIT_SUCCESS;
}
void
acb_hypgeom_ci_asymp(acb_t res, const acb_t z, slong prec)
{
acb_t t, u, w, v, one;
acb_init(t);
acb_init(u);
acb_init(w);
acb_init(v);
acb_init(one);
acb_one(one);
acb_mul_onei(w, z);
/* u = U(1,1,iz) */
acb_hypgeom_u_asymp(u, one, one, w, -1, prec);
/* v = e^(-iz) */
acb_neg(v, w);
acb_exp(v, v, prec);
acb_mul(t, u, v, prec);
if (acb_is_real(z))
{
arb_div(acb_realref(t), acb_imagref(t), acb_realref(z), prec);
arb_zero(acb_imagref(t));
acb_neg(t, t);
}
else
{
/* u = U(1,1,-iz) */
acb_neg(w, w);
acb_hypgeom_u_asymp(u, one, one, w, -1, prec);
acb_inv(v, v, prec);
acb_submul(t, u, v, prec);
acb_div(t, t, w, prec);
acb_mul_2exp_si(t, t, -1);
}
if (arb_is_zero(acb_realref(z)))
{
if (arb_is_positive(acb_imagref(z)))
{
arb_const_pi(acb_imagref(t), prec);
arb_mul_2exp_si(acb_imagref(t), acb_imagref(t), -1);
}
else if (arb_is_negative(acb_imagref(z)))
{
arb_const_pi(acb_imagref(t), prec);
arb_mul_2exp_si(acb_imagref(t), acb_imagref(t), -1);
arb_neg(acb_imagref(t), acb_imagref(t));
}
else
{
acb_const_pi(u, prec);
acb_mul_2exp_si(u, u, -1);
arb_zero(acb_imagref(t));
arb_add_error(acb_imagref(t), acb_realref(u));
}
}
else
{
/* 0 if positive or positive imaginary
pi if upper left quadrant (including negative real axis)
-pi if lower left quadrant (including negative imaginary axis) */
if (arb_is_positive(acb_realref(z)))
{
/* do nothing */
}
else if (arb_is_negative(acb_realref(z)) && arb_is_nonnegative(acb_imagref(z)))
{
acb_const_pi(u, prec);
arb_add(acb_imagref(t), acb_imagref(t), acb_realref(u), prec);
}
else if (arb_is_nonpositive(acb_realref(z)) && arb_is_negative(acb_imagref(z)))
{
acb_const_pi(u, prec);
arb_sub(acb_imagref(t), acb_imagref(t), acb_realref(u), prec);
}
else
{
/* add [-pi,pi] */
acb_const_pi(u, prec);
arb_add_error(acb_imagref(t), acb_realref(u));
}
}
acb_swap(res, t);
acb_clear(t);
acb_clear(u);
acb_clear(w);
acb_clear(v);
acb_clear(one);
}
void
acb_hypgeom_fresnel_erf(acb_t res1, acb_t res2, const acb_t z, slong prec)
{
acb_t t, u, v, w1, w2;
acb_init(t);
acb_init(v);
acb_init(w1);
if (arb_is_zero(acb_imagref(z)))
{
acb_mul_onei(t, z);
acb_add(w1, z, t, 2 * prec);
acb_hypgeom_erf(t, w1, prec + 4);
acb_mul_2exp_si(t, t, 1);
acb_mul_onei(v, t);
acb_add(t, t, v, prec);
if (res1 != NULL) acb_set_arb(res1, acb_realref(t));
if (res2 != NULL) acb_set_arb(res2, acb_imagref(t));
}
else if (arb_is_zero(acb_realref(z)))
{
acb_mul_onei(t, z);
acb_sub(w1, t, z, 2 * prec);
acb_hypgeom_erf(t, w1, prec + 4);
acb_mul_2exp_si(t, t, 1);
acb_mul_onei(v, t);
acb_add(t, t, v, prec);
if (res1 != NULL) acb_set_arb(res1, acb_realref(t));
if (res1 != NULL) acb_mul_onei(res1, res1);
if (res2 != NULL) acb_set_arb(res2, acb_imagref(t));
if (res2 != NULL) acb_div_onei(res2, res2);
}
else
{
acb_init(u);
acb_init(w2);
/* w1 = (1+i)z, w2 = (1-i)z */
acb_mul_onei(t, z);
acb_add(w1, z, t, 2 * prec);
acb_sub(w2, z, t, 2 * prec);
acb_hypgeom_erf(t, w1, prec + 4);
acb_hypgeom_erf(u, w2, prec + 4);
/* S = (1+i) (t - ui) = (1+i) t + (1-i) u */
/* C = (1-i) (t + ui) = (1-i) t + (1+i) u */
acb_mul_onei(v, t);
if (res1 != NULL) acb_add(res1, t, v, prec);
if (res2 != NULL) acb_sub(res2, t, v, prec);
acb_mul_onei(v, u);
if (res1 != NULL) acb_add(res1, res1, u, prec);
if (res1 != NULL) acb_sub(res1, res1, v, prec);
if (res2 != NULL) acb_add(res2, res2, u, prec);
if (res2 != NULL) acb_add(res2, res2, v, prec);
acb_clear(u);
acb_clear(w2);
}
acb_clear(t);
acb_clear(v);
acb_clear(w1);
}
void
acb_hypgeom_bessel_j_asymp(acb_t res, const acb_t nu, const acb_t z, long prec)
{
acb_t A1, A2, C, U1, U2, s, t, u;
int is_real, is_imag;
acb_init(A1);
acb_init(A2);
acb_init(C);
acb_init(U1);
acb_init(U2);
acb_init(s);
acb_init(t);
acb_init(u);
is_imag = 0;
is_real = acb_is_real(nu) && acb_is_real(z)
&& (acb_is_int(nu) || arb_is_positive(acb_realref(z)));
if (!is_real && arb_is_zero(acb_realref(z)) && acb_is_int(nu))
{
acb_mul_2exp_si(t, nu, -1);
if (acb_is_int(t))
is_real = 1;
else
is_imag = 1;
}
acb_hypgeom_bessel_j_asymp_prefactors(A1, A2, C, nu, z, prec);
/* todo: if Ap ~ 2^a and Am = 2^b and U1 ~ U2 ~ 1, change precision? */
if (!acb_is_finite(A1) || !acb_is_finite(A2) || !acb_is_finite(C))
{
acb_indeterminate(res);
}
else
{
/* s = 1/2 + nu */
acb_one(s);
acb_mul_2exp_si(s, s, -1);
acb_add(s, s, nu, prec);
/* t = 1 + 2 nu */
acb_mul_2exp_si(t, nu, 1);
acb_add_ui(t, t, 1, prec);
acb_mul_onei(u, z);
acb_mul_2exp_si(u, u, 1);
acb_hypgeom_u_asymp(U2, s, t, u, -1, prec);
acb_neg(u, u);
acb_hypgeom_u_asymp(U1, s, t, u, -1, prec);
acb_mul(res, A1, U1, prec);
acb_addmul(res, A2, U2, prec);
acb_mul(res, res, C, prec);
if (is_real)
arb_zero(acb_imagref(res));
if (is_imag)
arb_zero(acb_realref(res));
}
acb_clear(A1);
acb_clear(A2);
acb_clear(C);
acb_clear(U1);
acb_clear(U2);
acb_clear(s);
acb_clear(t);
acb_clear(u);
}
int main()
{
slong iter;
flint_rand_t state;
flint_printf("exp_pi_i....");
fflush(stdout);
flint_randinit(state);
for (iter = 0; iter < 10000 * arb_test_multiplier(); iter++)
{
acb_t a, b, c, d;
slong prec;
acb_init(a);
acb_init(b);
acb_init(c);
acb_init(d);
acb_randtest(a, state, 1 + n_randint(state, 200), 3);
acb_randtest(b, state, 1 + n_randint(state, 200), 3);
acb_randtest(c, state, 1 + n_randint(state, 200), 3);
acb_randtest(d, state, 1 + n_randint(state, 200), 3);
prec = 2 + n_randint(state, 200);
acb_exp_pi_i(b, a, prec);
acb_const_pi(c, prec);
acb_mul(c, c, a, prec);
acb_mul_onei(c, c);
acb_exp(d, c, prec);
if (!acb_overlaps(d, b))
{
flint_printf("FAIL: overlap\n\n");
flint_printf("a = "); acb_printd(a, 30); flint_printf("\n\n");
flint_printf("b = "); acb_printd(b, 30); flint_printf("\n\n");
flint_printf("c = "); acb_printd(c, 30); flint_printf("\n\n");
flint_printf("d = "); acb_printd(d, 30); flint_printf("\n\n");
abort();
}
acb_set(c, a);
acb_exp_pi_i(c, c, prec);
if (!acb_overlaps(c, d))
{
flint_printf("FAIL: aliasing\n\n");
flint_printf("a = "); acb_print(a); flint_printf("\n\n");
flint_printf("b = "); acb_print(b); flint_printf("\n\n");
flint_printf("c = "); acb_print(c); flint_printf("\n\n");
flint_printf("d = "); acb_print(d); flint_printf("\n\n");
abort();
}
acb_clear(a);
acb_clear(b);
acb_clear(c);
acb_clear(d);
}
flint_randclear(state);
flint_cleanup();
flint_printf("PASS\n");
return EXIT_SUCCESS;
}
int main()
{
slong iter;
flint_rand_t state;
flint_printf("fresnel....");
fflush(stdout);
flint_randinit(state);
for (iter = 0; iter < 10000 * arb_test_multiplier(); iter++)
{
acb_t z, z2, s, c, u, v;
slong prec1, prec2;
int normalized;
prec1 = 2 + n_randint(state, 500);
prec2 = 2 + n_randint(state, 500);
acb_init(z);
acb_init(z2);
acb_init(s);
acb_init(c);
acb_init(u);
acb_init(v);
acb_randtest_special(z, state, 1 + n_randint(state, 500), 1 + n_randint(state, 100));
acb_randtest_special(s, state, 1 + n_randint(state, 500), 1 + n_randint(state, 100));
acb_randtest_special(c, state, 1 + n_randint(state, 500), 1 + n_randint(state, 100));
normalized = n_randint(state, 2);
/* test S(z) + i C(z) = sqrt(pi/2) (1+i)/2 erf((1+i)/sqrt(2) z) */
/* u = rhs */
acb_onei(u);
acb_sqrt(u, u, prec1);
acb_mul(u, u, z, prec1);
acb_hypgeom_erf(u, u, prec1);
acb_mul_onei(v, u);
acb_add(u, u, v, prec1);
acb_mul_2exp_si(u, u, -1);
acb_const_pi(v, prec1);
acb_mul_2exp_si(v, v, -1);
acb_sqrt(v, v, prec1);
acb_mul(u, u, v, prec1);
if (normalized)
{
acb_const_pi(v, prec2);
acb_mul_2exp_si(v, v, -1);
acb_sqrt(v, v, prec2);
acb_div(z2, z, v, prec2);
}
else
{
acb_set(z2, z);
}
switch (n_randint(state, 4))
{
case 0:
acb_hypgeom_fresnel(s, c, z2, normalized, prec2);
break;
case 1:
acb_hypgeom_fresnel(s, NULL, z2, normalized, prec2);
acb_hypgeom_fresnel(NULL, c, z2, normalized, prec2);
break;
case 2:
acb_set(s, z2);
acb_hypgeom_fresnel(s, c, s, normalized, prec2);
break;
case 3:
acb_set(c, z2);
acb_hypgeom_fresnel(s, c, c, normalized, prec2);
break;
default:
acb_hypgeom_fresnel(s, c, z2, normalized, prec2);
}
if (normalized)
{
acb_mul(s, s, v, prec2);
acb_mul(c, c, v, prec2);
}
acb_mul_onei(v, c);
acb_add(v, v, s, prec2);
if (!acb_overlaps(u, v))
{
flint_printf("FAIL: overlap\n\n");
flint_printf("z = "); acb_printd(z, 30); flint_printf("\n\n");
flint_printf("s = "); acb_printd(s, 30); flint_printf("\n\n");
flint_printf("c = "); acb_printd(c, 30); flint_printf("\n\n");
flint_printf("u = "); acb_printd(u, 30); flint_printf("\n\n");
flint_printf("v = "); acb_printd(v, 30); flint_printf("\n\n");
abort();
}
acb_clear(z);
acb_clear(z2);
acb_clear(s);
acb_clear(c);
acb_clear(u);
acb_clear(v);
}
flint_randclear(state);
flint_cleanup();
flint_printf("PASS\n");
return EXIT_SUCCESS;
}
static void
acb_log_sin_pi_half(acb_t res, const acb_t z, slong prec, int upper)
{
acb_t t, u, zmid;
arf_t n;
arb_t pi;
acb_init(t);
acb_init(u);
acb_init(zmid);
arf_init(n);
arb_init(pi);
arf_set(arb_midref(acb_realref(zmid)), arb_midref(acb_realref(z)));
arf_set(arb_midref(acb_imagref(zmid)), arb_midref(acb_imagref(z)));
arf_floor(n, arb_midref(acb_realref(zmid)));
arb_sub_arf(acb_realref(zmid), acb_realref(zmid), n, prec);
arb_const_pi(pi, prec);
if (arf_cmpabs_2exp_si(arb_midref(acb_imagref(zmid)), 2) < 1)
{
acb_sin_pi(t, zmid, prec);
acb_log(t, t, prec);
}
else /* i*pi*(z-0.5) + log((1-exp(-2i*pi*z))/2) */
{
acb_mul_2exp_si(t, zmid, 1);
acb_neg(t, t);
if (upper)
acb_conj(t, t);
acb_exp_pi_i(t, t, prec);
acb_sub_ui(t, t, 1, prec);
acb_neg(t, t);
acb_mul_2exp_si(t, t, -1);
acb_log(t, t, prec);
acb_one(u);
acb_mul_2exp_si(u, u, -1);
acb_sub(u, zmid, u, prec);
if (upper)
acb_conj(u, u);
acb_mul_onei(u, u);
acb_addmul_arb(t, u, pi, prec);
if (upper)
acb_conj(t, t);
}
if (upper)
arb_submul_arf(acb_imagref(t), pi, n, prec);
else
arb_addmul_arf(acb_imagref(t), pi, n, prec);
/* propagated error bound from the derivative pi cot(pi z) */
if (!acb_is_exact(z))
{
mag_t zm, um;
mag_init(zm);
mag_init(um);
acb_cot_pi(u, z, prec);
acb_mul_arb(u, u, pi, prec);
mag_hypot(zm, arb_radref(acb_realref(z)), arb_radref(acb_imagref(z)));
acb_get_mag(um, u);
mag_mul(um, um, zm);
acb_add_error_mag(t, um);
mag_clear(zm);
mag_clear(um);
}
acb_set(res, t);
acb_clear(t);
acb_clear(u);
acb_clear(zmid);
arf_clear(n);
arb_clear(pi);
}
int main()
{
slong iter;
flint_rand_t state;
flint_printf("exp_pi_i_series....");
fflush(stdout);
flint_randinit(state);
for (iter = 0; iter < 1000 * arb_test_multiplier(); iter++)
{
slong m, n, prec;
acb_poly_t a, b, c;
acb_t t;
acb_poly_init(a);
acb_poly_init(b);
acb_poly_init(c);
acb_init(t);
prec = 2 + n_randint(state, 100);
acb_poly_randtest(a, state, 1 + n_randint(state, 20), prec, 5);
acb_poly_randtest(b, state, 1 + n_randint(state, 20), prec, 5);
acb_poly_randtest(c, state, 1 + n_randint(state, 20), prec, 5);
m = n_randint(state, 20);
n = n_randint(state, 20);
if (n_randint(state, 2) == 0)
acb_poly_exp_pi_i_series(b, a, m, prec);
else
{
acb_poly_set(b, a);
acb_poly_exp_pi_i_series(b, b, m, prec);
}
acb_const_pi(t, prec);
acb_mul_onei(t, t);
acb_poly_scalar_mul(c, a, t, prec);
acb_poly_exp_series(c, c, n, prec);
acb_poly_truncate(b, FLINT_MIN(m, n));
acb_poly_truncate(c, FLINT_MIN(m, n));
if (!acb_poly_overlaps(b, c))
{
flint_printf("FAIL\n\n");
flint_printf("a = "); acb_poly_printd(a, 15); flint_printf("\n\n");
flint_printf("b = "); acb_poly_printd(b, 15); flint_printf("\n\n");
flint_printf("c = "); acb_poly_printd(c, 15); flint_printf("\n\n");
flint_abort();
}
acb_poly_clear(a);
acb_poly_clear(b);
acb_poly_clear(c);
acb_clear(t);
}
flint_randclear(state);
flint_cleanup();
flint_printf("PASS\n");
return EXIT_SUCCESS;
}
