C++ (Cpp) _acb_vec_scalar_addmul示例

示例#1

文件： lu.c 项目： UBunt14/SourceOfBasicLibraries

int
acb_mat_lu(long * P, acb_mat_t LU, const acb_mat_t A, long prec)
{
    acb_t d, e;
    acb_ptr * a;
    long i, j, m, n, r, row, col;
    int result;

    m = acb_mat_nrows(A);
    n = acb_mat_ncols(A);

    result = 1;

    if (m == 0 || n == 0)
        return result;

    acb_mat_set(LU, A);

    a = LU->rows;

    row = col = 0;
    for (i = 0; i < m; i++)
        P[i] = i;

    acb_init(d);
    acb_init(e);

    while (row < m && col < n)
    {
        r = acb_mat_find_pivot_partial(LU, row, m, col);

        if (r == -1)
        {
            result = 0;
            break;
        }
        else if (r != row)
            acb_mat_swap_rows(LU, P, row, r);

        acb_set(d, a[row] + col);

        for (j = row + 1; j < m; j++)
        {
            acb_div(e, a[j] + col, d, prec);
            acb_neg(e, e);
            _acb_vec_scalar_addmul(a[j] + col,
                a[row] + col, n - col, e, prec);
            acb_zero(a[j] + col);
            acb_neg(a[j] + row, e);
        }

        row++;
        col++;
    }

    acb_clear(d);
    acb_clear(e);

    return result;
}

示例#2

文件： mullow_classical.c 项目： isuruf/arb

void
_acb_poly_mullow_classical(acb_ptr res,
    acb_srcptr poly1, slong len1,
    acb_srcptr poly2, slong len2, slong n, slong prec)
{
    len1 = FLINT_MIN(len1, n);
    len2 = FLINT_MIN(len2, n);

    if (n == 1)
    {
        acb_mul(res, poly1, poly2, prec);
    }
    else if (poly1 == poly2 && len1 == len2)
    {
        slong i;

        _acb_vec_scalar_mul(res, poly1, FLINT_MIN(len1, n), poly1, prec);
        _acb_vec_scalar_mul(res + len1, poly1 + 1, n - len1, poly1 + len1 - 1, prec);

        for (i = 1; i < len1 - 1; i++)
            _acb_vec_scalar_addmul(res + i + 1, poly1 + 1,
                FLINT_MIN(i - 1, n - (i + 1)), poly1 + i, prec);

        for (i = 1; i < FLINT_MIN(2 * len1 - 2, n); i++)
            acb_mul_2exp_si(res + i, res + i, 1);

        for (i = 1; i < FLINT_MIN(len1 - 1, (n + 1) / 2); i++)
            acb_addmul(res + 2 * i, poly1 + i, poly1 + i, prec);
    }
    else
    {
        slong i;

        _acb_vec_scalar_mul(res, poly1, FLINT_MIN(len1, n), poly2, prec);

        if (n > len1)
            _acb_vec_scalar_mul(res + len1, poly2 + 1, n - len1,
                                      poly1 + len1 - 1, prec);

        for (i = 0; i < FLINT_MIN(len1, n) - 1; i++)
            _acb_vec_scalar_addmul(res + i + 1, poly2 + 1,
                                         FLINT_MIN(len2, n - i) - 1,
                                         poly1 + i, prec);
    }
}