// #[inline(never)] /// extracts four values: the column, the row, the time-over-threshold, and the /// time-of-arrival from a "hit" packet; unsafe due to being extremely "hot" code for reading /// shift rights after multiplication are in place of division; 25_000 is 25 * 1000; 409600000 /// is 16384 * 1000 * 25
时间: 2024-01-01 12:03:31 浏览: 27
这段代码是一个被注释掉的函数,并包含一些注释说明。根据注释的描述,这段代码用于从一个 "hit" 数据包中提取出四值:列号(column)、行号(row)、时间超过阈值(time-over-threshold)和到达时间(time-of-arrival)。
根据注释的说明,由于这段代码是非常高频率的代码用于读取数据,因此被标记为 `extremely "hot" code`。此外,代码中使用了位移操作来替代除法运算,以提高性能。
具体的数值常量说明如下:
- `25_000` 表示 25 乘以 1000。
- `409600000` 表示 16384 乘以 1000 乘以 25。
然而,由于该函数被注释掉了,并且没有给出具体的代码实现,无法提供更详细的解释和功能描述。如果需要进一步了解该函数的功能和实现,请查看相关的代码实现或者取消注释以便进行调用和使用。
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fname <- rev(strsplit(fx, '/')[[1]])[2]
This code snippet extracts the second-to-last element from a string that is separated by forward slashes ("/").
Here's how it works:
1. `strsplit(fx, '/')` splits the string stored in `fx` using the "/" character as a delimiter. This creates a list of substrings.
2. `[[1]]` selects the first element of the list, which is itself a character vector.
3. `rev()` reverses the order of the elements in the character vector.
4. `[2]` selects the second element of the reversed vector, which is the second-to-last element of the original vector.
Finally, the result is assigned to a variable called `fname`.
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