用bigz类计算

Question

我正在尝试计算r中的一些欧拉数。我发现包含gmp的函数“eulerian”似乎是这样做的。但是，返回值在类bigz中，我似乎无法提取此值来执行与其他非bigz值的简单计算（乘法等）。有没有办法提取它或其他工作？我试过使用结果$ bigz，结果[1]等等。

我的功能：

static int
tb_displayline(PyObject *f, PyObject *filename, int lineno, PyObject *name)
{
    int err;
    PyObject *line;

    if (filename == NULL || name == NULL)
        return -1;
    line = PyUnicode_FromFormat("  File \"%U\", line %d, in %U\n",
                                filename, lineno, name);
    if (line == NULL)
        return -1;
    err = PyFile_WriteObject(line, f, Py_PRINT_RAW);
    Py_DECREF(line);
    if (err != 0)
        return err;
    /* ignore errors since we can't report them, can we? */
    if (_Py_DisplaySourceLine(f, filename, lineno, 4))
        PyErr_Clear();
    return err;
}

static int
tb_printinternal(PyTracebackObject *tb, PyObject *f, long limit)
{
    int err = 0;
    long depth = 0;
    PyTracebackObject *tb1 = tb;
    while (tb1 != NULL) {
        depth++;
        tb1 = tb1->tb_next;
    }
    while (tb != NULL && err == 0) {
        if (depth <= limit) {
            err = tb_displayline(f,
                                 tb->tb_frame->f_code->co_filename,
                                 tb->tb_lineno,
                                 tb->tb_frame->f_code->co_name);
        }
        depth--;
        tb = tb->tb_next;
        if (err == 0)
            err = PyErr_CheckSignals();
    }
    return err;
}