Esempi in C++ (Cpp) per arf_init_set_mag_shallow

Esempio n. 1

void
arb_max(arb_t z, const arb_t x, const arb_t y, slong prec)
{
    arf_t left, right, t, xr, yr;

    if (arf_is_nan(arb_midref(x)) || arf_is_nan(arb_midref(y)))
    {
        arb_indeterminate(z);
        return;
    }

    arf_init(left);
    arf_init(right);
    arf_init(t);

    arf_init_set_mag_shallow(xr, arb_radref(x));
    arf_init_set_mag_shallow(yr, arb_radref(y));

    arf_sub(left, arb_midref(x), xr, prec, ARF_RND_FLOOR);
    arf_sub(t, arb_midref(y), yr, prec, ARF_RND_FLOOR);
    arf_max(left, left, t);

    arf_add(right, arb_midref(x), xr, prec, ARF_RND_CEIL);
    arf_add(t, arb_midref(y), yr, prec, ARF_RND_CEIL);
    arf_max(right, right, t);

    arb_set_interval_arf(z, left, right, prec);

    arf_clear(left);
    arf_clear(right);
    arf_clear(t);
}

Esempio n. 2

File: get_lbound_arf.c Progetto: fredrik-johansson/arb

void
arb_get_lbound_arf(arf_t u, const arb_t x, long prec)
{
    arf_t t;
    arf_init_set_mag_shallow(t, arb_radref(x));

    arf_sub(u, arb_midref(x), t, prec, ARF_RND_FLOOR);
}

Esempio n. 3

int
arb_contains_arf(const arb_t x, const arf_t y)
{
    if (arf_is_nan(y))
    {
        return arf_is_nan(arb_midref(x));
    }
    else if (arf_is_nan(arb_midref(x)))
    {
        return 1;
    }
    else if (arb_is_exact(x))
    {
        return arf_equal(arb_midref(x), y);
    }
    else
    {
        arf_t t;
        arf_struct tmp[3];
        int result;

        arf_init(t);

        /* y >= xm - xr  <=>  0 >= xm - xr - y */
        arf_init_set_shallow(tmp + 0, arb_midref(x));
        arf_init_neg_mag_shallow(tmp + 1,  arb_radref(x));
        arf_init_neg_shallow(tmp + 2, y);

        arf_sum(t, tmp, 3, MAG_BITS, ARF_RND_DOWN);
        result = (arf_sgn(t) <= 0);

        if (result)
        {
            /* y <= xm + xr  <=>  0 <= xm + xr - y */
            arf_init_set_mag_shallow(tmp + 1,  arb_radref(x));
            arf_sum(t, tmp, 3, MAG_BITS, ARF_RND_DOWN);
            result = (arf_sgn(t) >= 0);
        }

        arf_clear(t);

        return result;
    }
}