Python 将自定义函数插值到系列
这是一个df:Python 将自定义函数插值到系列,python,pandas,interpolation,Python,Pandas,Interpolation,这是一个df: 2005-01-24 117.0 2005-02-22 NaN 2005-03-21 NaN 2005-04-18 114.0 2005-05-23 NaN 2005-06-20 NaN 2005-07-18 122.0 预期输出是将上下值的平均值填充NaN值,如下所示: 2005-01-24 117.0 2005-02-22 115.5 (117-114 / 2) 2005-03-21 115.
2005-01-24 117.0
2005-02-22 NaN
2005-03-21 NaN
2005-04-18 114.0
2005-05-23 NaN
2005-06-20 NaN
2005-07-18 122.0
预期输出是将上下值的平均值填充NaN值,如下所示:
2005-01-24 117.0
2005-02-22 115.5 (117-114 / 2)
2005-03-21 115.5
2005-04-18 114.0
2005-05-23 118.0 (122-114 / 2)
2005-07-18 122.0
据我所知,df.interpolate()不允许传递函数?我们还尝试了.rolling(2).mean()和重新编制索引,但没有成功 假设您的数据是s系列:
import pandas as pd
import numpy as np
s = pd.Series({'2005-01-24': 117.0,
'2005-02-22': np.nan,
'2005-03-21': np.nan,
'2005-04-18': 114.0,
'2005-05-23': np.nan,
'2005-06-20': np.nan,
'2005-07-18': 122.0})
您可以使用ffill和bfill查找上下界,然后取平均值
s.ffill().add(s.bfill()).div(2)
Out[71]:
2005-01-24 117.0
2005-02-22 115.5
2005-03-21 115.5
2005-04-18 114.0
2005-05-23 118.0
2005-06-20 118.0
2005-07-18 122.0
dtype: float64
我猜你的意思是(117+114/2)而不是(117-114/2)?太干净了。谢谢