// TODO: adjust sign
int mpf_gamma(mp_float * a, mp_float * b)
{
int err;
long oldeps, eps;
mp_float t;
err = MP_OKAY;
oldeps = a->radix;
eps = oldeps + MP_DIGIT_BIT;
if ((err = mpf_init(&t, oldeps)) != MP_OKAY) {
return err;
}
if ((err = mpf_copy(a, &t)) != MP_OKAY) {
goto _ERR;
}
if ((err = mpf_normalize_to(&t, eps)) != MP_OKAY) {
goto _ERR;
}
if ((err = mpf_lngamma(&t, &t)) != MP_OKAY) {
goto _ERR;
}
if ((err = mpf_exp(&t, &t)) != MP_OKAY) {
goto _ERR;
}
if ((err = mpf_normalize_to(&t, oldeps)) != MP_OKAY) {
goto _ERR;
}
mpf_exch(&t, b);
_ERR:
mpf_clear(&t);
return err;
}
// Computes q = exp(2 pi i tau).
static void compute_q(mpc_t q, mpc_t tau) {
mpc_t z0;
mpf_t f0, f1;
mpf_ptr fp0;
pbc_mpui pwr;
mpc_init(z0);
mpf_init(f0);
mpf_init(f1);
//compute z0 = 2 pi i tau
mpc_set(z0, tau);
//first remove integral part of Re(tau)
//since exp(2 pi i) = 1
//it seems |Re(tau)| < 1 anyway?
fp0 = mpc_re(z0);
mpf_trunc(f1, fp0);
mpf_sub(fp0, fp0, f1);
mpc_mul_mpf(z0, z0, pi);
mpc_mul_ui(z0, z0, 2);
mpc_muli(z0, z0);
//compute q = exp(z0);
//first write z0 = A + a + b i
//where A is a (negative) integer
//and a, b are in [-1, 1]
//compute e^A separately
fp0 = mpc_re(z0);
pwr = mpf_get_ui(fp0);
mpf_pow_ui(f0, recipeulere, pwr);
mpf_add_ui(fp0, fp0, pwr);
mpf_exp(f1, mpc_re(z0));
mpf_mul(f0, f1, f0);
mpc_cis(q, mpc_im(z0));
/*
old_mpc_exp(q, z0);
*/
mpc_mul_mpf(q, q, f0);
mpc_clear(z0);
mpf_clear(f0);
mpf_clear(f1);
}
int main(void)
{
mp_float a, b, c, d, e;
int err;
mpf_init_multi(100, &a, &b, &c, &d, &e, NULL);
mpf_const_d(&a, 1);
draw(&a);
mpf_const_d(&b, 2);
draw(&b);
mpf_const_d(&c, 3);
draw(&c);
mpf_const_d(&d, 4);
draw(&d);
mpf_add(&b, &c, &e);
printf("2 + 3 == ");
draw(&e);
mpf_sub(&b, &c, &e);
printf("2 - 3 ==");
draw(&e);
mpf_mul(&b, &c, &e);
printf("2 * 3 == ");
draw(&e);
mpf_div(&b, &c, &e);
printf("2 / 3 == ");
draw(&e);
mpf_add_d(&b, 3, &e);
printf("2 + 3 == ");
draw(&e);
mpf_sub_d(&b, 3, &e);
printf("2 - 3 ==");
draw(&e);
mpf_mul_d(&b, 3, &e);
printf("2 * 3 == ");
draw(&e);
mpf_div_d(&b, 3, &e);
printf("2 / 3 == ");
draw(&e);
mpf_const_d(&e, 0);
mpf_add_d(&e, 1, &e);
printf("0 + 1 == ");
draw(&e);
mpf_const_d(&e, 0);
mpf_sub_d(&e, 1, &e);
printf("0 - 1 == ");
draw(&e);
printf("\n");
mpf_invsqrt(&d, &e);
printf("1/sqrt(4) == 1/2 == ");
draw(&e);
mpf_invsqrt(&c, &e);
printf("1/sqrt(3) == ");
draw(&e);
mpf_inv(&a, &e);
printf("1/1 == ");
draw(&e);
mpf_inv(&b, &e);
printf("1/2 == ");
draw(&e);
mpf_inv(&c, &e);
printf("1/3 == ");
draw(&e);
mpf_inv(&d, &e);
printf("1/4 == ");
draw(&e);
printf("\n");
mpf_const_pi(&e);
printf("Pi == ");
draw(&e);
printf("\n");
mpf_const_e(&e);
printf("e == ");
draw(&e);
mpf_exp(&c, &e);
printf("e^3 == ");
draw(&e);
mpf_sqrt(&e, &e);
printf("sqrt(e^3) == ");
draw(&e);
mpf_sqr(&e, &e);
printf("sqrt(e^3)^2 == ");
draw(&e);
printf("\n");
mpf_cos(&a, &e);
printf("cos(1) == ");
draw(&e);
mpf_cos(&b, &e);
printf("cos(2) == ");
draw(&e);
mpf_cos(&c, &e);
printf("cos(3) == ");
draw(&e);
mpf_cos(&d, &e);
printf("cos(4) == ");
draw(&e);
mpf_sin(&a, &e);
printf("sin(1) == ");
draw(&e);
mpf_sin(&b, &e);
printf("sin(2) == ");
draw(&e);
mpf_sin(&c, &e);
printf("sin(3) == ");
draw(&e);
mpf_sin(&d, &e);
printf("sin(4) == ");
draw(&e);
mpf_tan(&a, &e);
printf("tan(1) == ");
draw(&e);
mpf_tan(&b, &e);
printf("tan(2) == ");
draw(&e);
mpf_tan(&c, &e);
printf("tan(3) == ");
draw(&e);
mpf_tan(&d, &e);
printf("tan(4) == ");
draw(&e);
mpf_inv(&a, &e);
mpf_atan(&e, &e);
printf("atan(1/1) == ");
draw(&e);
mpf_inv(&b, &e);
mpf_atan(&e, &e);
printf("atan(1/2) == ");
draw(&e);
mpf_inv(&c, &e);
mpf_atan(&e, &e);
printf("atan(1/3) == ");
draw(&e);
mpf_inv(&d, &e);
mpf_atan(&e, &e);
printf("atan(1/4) == ");
draw(&e);
printf("\n");
#define lntest(x) if ((err = mpf_const_ln_d(&e, x)) != MP_OKAY) { printf("Failed ln(%3d), %d\n", x, err); } else { printf("ln(%3d) == ", x); draw(&e); };
lntest(0);
lntest(1);
lntest(2);
lntest(4);
lntest(8);
lntest(17);
lntest(1000);
lntest(100000);
lntest(250000);
return 0;
}
