Python 熊猫不规则时间序列的下采样
我有一个熊猫的时间序列,看起来像这样:Python 熊猫不规则时间序列的下采样,python,pandas,Python,Pandas,我有一个熊猫的时间序列,看起来像这样: 2012-01-01 00:00:00.250000 12 2012-01-01 00:00:00.257000 34 2012-01-01 00:00:00.258000 45 2012-01-01 00:00:01.350000 56 2012-01-01 00:00:02.300000 78 2012-01-01 00:00:03.200000 89 2012-01-01 00:00:03.500000 9
2012-01-01 00:00:00.250000 12
2012-01-01 00:00:00.257000 34
2012-01-01 00:00:00.258000 45
2012-01-01 00:00:01.350000 56
2012-01-01 00:00:02.300000 78
2012-01-01 00:00:03.200000 89
2012-01-01 00:00:03.500000 90
2012-01-01 00:00:04.200000 12
有没有一种方法可以在不与1秒边界对齐的情况下将其采样降至1秒数据?例如,是否有一种方法可以获取此数据(假设使用采样时间之前或当天出现的最新值进行下采样):
创建一个DateTimeIndex,频率为1秒,偏移量为四分之一秒,如下所示
index = pd.date_range('2012-01-01 00:00:00.25',
'2012-01-01 00:00:04.25', freq='S')
使您的数据符合此索引,并“向前填充”以按您在所需结果中显示的方式进行下采样
s.reindex(index, method='ffill')
data
2012-01-01 00:00:00.250000 12
2012-01-01 00:00:01.250000 45
2012-01-01 00:00:02.250000 56
2012-01-01 00:00:03.250000 89
2012-01-01 00:00:04.250000 12
s.reindex(index, method='ffill')
data
2012-01-01 00:00:00.250000 12
2012-01-01 00:00:01.250000 45
2012-01-01 00:00:02.250000 56
2012-01-01 00:00:03.250000 89
2012-01-01 00:00:04.250000 12