pandas 时间戳不规则地四舍五入30秒 [英] Pandas Timestamp rounds 30 seconds inconsistently

问题描述

我正在尝试将熊猫的DatetimeIndex(或Timestamp)四舍五入到最近的分钟，但是Timestamps为30秒时我遇到了问题-有些向上舍入，有些向下舍入(这似乎是交替的).

有什么建议可以解决这个问题，以使30s总是四舍五入?

 >>> pd.Timestamp(2019,6,1,6,57,30).round('1T')
Timestamp('2019-06-01 06:58:00')

>>> pd.Timestamp(2019,6,1,6,58,30).round('1T')
Timestamp('2019-06-01 06:58:00')
 

最好的结果看起来不错，有57m个30s取整为58m，但是我希望最下面的结果可以取整到59m-不小于58m.

解决方案

四舍五入是一致的；接下来的选择是当在两个整数之间的中间时，选择了偶数整数".您需要上半舍入，这将需要您自己实现.

import numpy as np
import pandas as pd

def half_up_minute(x):
    m = (x - x.dt.floor('1T')).dt.total_seconds() < 30   # Round True Down, False Up
    return x.where(m).dt.floor('1T').fillna(x.dt.ceil('1T'))

# For indices:
def half_up_minute_idx(idx):
    m = (idx - idx.floor('1T')).total_seconds() < 30   # Round True Down, False Up
    return pd.Index(np.select([m], [idx.floor('1T')], default=idx.ceil('1T')))

# Sample Data
df = pd.DataFrame({'date': pd.date_range('2019-01-01', freq='15S', periods=10)})
df['rounded'] = half_up_minute(df.date)

输出:

                 date             rounded
0 2019-01-01 00:00:00 2019-01-01 00:00:00
1 2019-01-01 00:00:15 2019-01-01 00:00:00
2 2019-01-01 00:00:30 2019-01-01 00:01:00
3 2019-01-01 00:00:45 2019-01-01 00:01:00
4 2019-01-01 00:01:00 2019-01-01 00:01:00
5 2019-01-01 00:01:15 2019-01-01 00:01:00
6 2019-01-01 00:01:30 2019-01-01 00:02:00
7 2019-01-01 00:01:45 2019-01-01 00:02:00
8 2019-01-01 00:02:00 2019-01-01 00:02:00
9 2019-01-01 00:02:15 2019-01-01 00:02:00

I'm trying to round a pandas DatetimeIndex (or Timestamp) to the nearest minute, but I'm having a problem with Timestamps of 30 seconds - some rounding up, some rounding down (this seems to alternate).

Any suggestions to fix this so that 30s always rounds up?

>>> pd.Timestamp(2019,6,1,6,57,30).round('1T')
Timestamp('2019-06-01 06:58:00')

>>> pd.Timestamp(2019,6,1,6,58,30).round('1T')
Timestamp('2019-06-01 06:58:00')

The top result looks fine, with 57m 30s rounding up to 58m, but I'd expect the bottom result to round up to 59m - not down to 58m.

解决方案

The rounding is consistent; the choice followed is, "when halfway between two integers the even integer is chosen." You want half-up rounding, which you will need to implement yourself.

import numpy as np
import pandas as pd

def half_up_minute(x):
    m = (x - x.dt.floor('1T')).dt.total_seconds() < 30   # Round True Down, False Up
    return x.where(m).dt.floor('1T').fillna(x.dt.ceil('1T'))

# For indices:
def half_up_minute_idx(idx):
    m = (idx - idx.floor('1T')).total_seconds() < 30   # Round True Down, False Up
    return pd.Index(np.select([m], [idx.floor('1T')], default=idx.ceil('1T')))

# Sample Data
df = pd.DataFrame({'date': pd.date_range('2019-01-01', freq='15S', periods=10)})
df['rounded'] = half_up_minute(df.date)

Output:

                 date             rounded
0 2019-01-01 00:00:00 2019-01-01 00:00:00
1 2019-01-01 00:00:15 2019-01-01 00:00:00
2 2019-01-01 00:00:30 2019-01-01 00:01:00
3 2019-01-01 00:00:45 2019-01-01 00:01:00
4 2019-01-01 00:01:00 2019-01-01 00:01:00
5 2019-01-01 00:01:15 2019-01-01 00:01:00
6 2019-01-01 00:01:30 2019-01-01 00:02:00
7 2019-01-01 00:01:45 2019-01-01 00:02:00
8 2019-01-01 00:02:00 2019-01-01 00:02:00
9 2019-01-01 00:02:15 2019-01-01 00:02:00

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