我有这个df
dateTime 1min hour minute X EXPECTED Rolling_X
2017-09-19 02:00:04 2017-09-19 02:00:00 2 0 5 5
2017-09-19 02:00:04 2017-09-19 02:00:00 2 0 1 6
2017-09-19 02:00:04 2017-09-19 02:00:00 2 0 1 7
2017-09-19 02:00:22 2017-09-19 02:00:00 2 0 2 9
2017-09-19 02:01:31 2017-09-19 02:01:00 2 1 0 9
2017-09-19 02:01:31 2017-09-19 02:01:00 2 1 1 10
2017-09-19 02:01:32 2017-09-19 02:01:00 2 1 1 11
2017-09-19 02:01:34 2017-09-19 02:01:00 2 1 6 17
2017-09-19 02:01:35 2017-09-19 02:01:00 2 1 5 22
2017-09-19 02:01:35 2017-09-19 02:01:00 2 1 0 22
2017-09-19 02:01:39 2017-09-19 02:01:00 2 1 1 23
2017-09-19 02:01:58 2017-09-19 02:01:00 2 1 2 25
2017-09-19 02:01:58 2017-09-19 02:01:00 2 1 0 25
2017-09-19 02:02:02 2017-09-19 02:02:00 2 2 3 19
2017-09-19 02:02:32 2017-09-19 02:02:00 2 2 0 19
2017-09-19 02:02:32 2017-09-19 02:02:00 2 2 1 20
2017-09-19 02:02:40 2017-09-19 02:02:00 2 2 15 35
2017-09-19 02:02:41 2017-09-19 02:02:00 2 2 6 41
2017-09-19 02:02:44 2017-09-19 02:02:00 2 2 1 42
2017-09-19 02:02:53 2017-09-19 02:02:00 2 2 3 45
2017-09-19 02:03:00 2017-09-19 02:03:00 2 3 1 30
2017-09-19 02:03:00 2017-09-19 02:03:00 2 3 1 31
2017-09-19 02:03:05 2017-09-19 02:03:00 2 3 1 32
2017-09-19 02:04:07 2017-09-19 02:04:00 2 4 7 10
2017-09-19 02:04:58 2017-09-19 02:04:00 2 4 2 12
2017-09-19 02:05:22 2017-09-19 02:05:00 2 5 11 23
2017-09-19 02:05:36 2017-09-19 02:05:00 2 5 2 25
我正在寻找继续滚动总和，这取决于会议记录。
我需要在最后2分钟继续滚动。因此，每当我得到X的总和，但是当日期时间增加1分钟时，它会减少前一个尾部1分钟，所以我将只持续2分钟。 问题是每分钟没有相同数量的数据。
我试过你用过：
s2m = df['dateTime'].dt.floor('2T').diff().shift(-1).eq(pd.Timedelta('2 minutes'))
s2m1 = df['X'].cumsum()
df['truncate_2m'] = s2m.mul(s2m1).diff().where(lambda x: x < 0).ffill().add(s2m1, fill_value=0)
但它每2分钟休息一次，而不是继续滚动。
感谢您的帮助！
答案 0 :(得分：1)
好的，你现在需要滚动。
df = df.set_index('dateTime')
df['Roll_X'] = df.rolling('2T')['X'].sum()
df
输出：
1min hour minute X EXPECTED Rolling_X Roll_X
dateTime
2017-09-19 02:00:04 2017-09-19 02:00:00 2 0 5 5 5.0
2017-09-19 02:00:04 2017-09-19 02:00:00 2 0 1 6 6.0
2017-09-19 02:00:04 2017-09-19 02:00:00 2 0 1 7 7.0
2017-09-19 02:00:22 2017-09-19 02:00:00 2 0 2 9 9.0
2017-09-19 02:01:31 2017-09-19 02:01:00 2 1 0 9 9.0
2017-09-19 02:01:31 2017-09-19 02:01:00 2 1 1 10 10.0
2017-09-19 02:01:32 2017-09-19 02:01:00 2 1 1 11 11.0
2017-09-19 02:01:34 2017-09-19 02:01:00 2 1 6 17 17.0
2017-09-19 02:01:35 2017-09-19 02:01:00 2 1 5 22 22.0
2017-09-19 02:01:35 2017-09-19 02:01:00 2 1 0 22 22.0
2017-09-19 02:01:39 2017-09-19 02:01:00 2 1 1 23 23.0
2017-09-19 02:01:58 2017-09-19 02:01:00 2 1 2 25 25.0
2017-09-19 02:01:58 2017-09-19 02:01:00 2 1 0 25 25.0
2017-09-19 02:02:02 2017-09-19 02:02:00 2 2 3 19 28.0
2017-09-19 02:02:32 2017-09-19 02:02:00 2 2 0 19 19.0
2017-09-19 02:02:32 2017-09-19 02:02:00 2 2 1 20 20.0
2017-09-19 02:02:40 2017-09-19 02:02:00 2 2 15 35 35.0
2017-09-19 02:02:41 2017-09-19 02:02:00 2 2 6 41 41.0
2017-09-19 02:02:44 2017-09-19 02:02:00 2 2 1 42 42.0
2017-09-19 02:02:53 2017-09-19 02:02:00 2 2 3 45 45.0
2017-09-19 02:03:00 2017-09-19 02:03:00 2 3 1 30 46.0
2017-09-19 02:03:00 2017-09-19 02:03:00 2 3 1 31 47.0
2017-09-19 02:03:05 2017-09-19 02:03:00 2 3 1 32 48.0
2017-09-19 02:04:07 2017-09-19 02:04:00 2 4 7 10 36.0
2017-09-19 02:04:58 2017-09-19 02:04:00 2 4 2 12 12.0
2017-09-19 02:05:22 2017-09-19 02:05:00 2 5 11 23 20.0
2017-09-19 02:05:36 2017-09-19 02:05:00 2 5 2 25 22.0
检查2:03左右，值不同。当我得到46时，你是如何计算30的？