int32_t tmp;
    for (i = 0; i < ARRAYSIZE_PLOT; ++i)
    {
        tmp = output[i].r * output[i].r + output[i].i * output[i].i;

        while (tmp > 0x7FFFFFFF) tmp >>= 1; /* we can only work on positive values */
        if (tmp > 0)
        {
            tmp = fp_sqrt(tmp, 8); /* linear scaling, nothing
                                      bad should happen */

            if (logarithmic)
            {
                tmp = get_log_value(tmp << 8); /* the log function
                                                  expects s15.16 values */
            }
        }
        plot[i] = tmp;
    }