R:我如何根据条件DateTime数据进行子集化

时间:2017-11-23 20:44:32

标签: r datetime dplyr subset lubridate

以下是我的数据示例:

# A tibble: 4 x 3
  Squirrel.ID  Release.time  DetectTime
        <int>  <S4: Period>  <dttm>
1       13097   13H 13M 18S 2017-05-29 18:50:43
2       20948   10H 15M 8S  2017-06-05 08:09:48
3       21853   11H 20M 33S 2017-05-24 21:57:32
4       13088   12H 13M 45S 2017-05-30 08:44:03

我希望将其子集用于hte DetectTime值出现至少 1.5小时 Release.time值之前的行。例如,如果我的DetectTime值为"2017-05-30 06:00:00"Release.time值为"10:00:00",那么我希望保留该行。如果我的DetectTime值为"2017-05-30 10:15:00"且值Release.time"10:00:00",那么我会排除该行。

如果有帮助,我正在使用dplyrlubridate。谢谢。

1 个答案:

答案 0 :(得分:0)

复制您的数据:

library(lubridate)

df <- data.frame(Squirrel.ID = c(13097, 20948, 21853, 13088),
      Release.time = c("13H 13M 18S", "10H 15M 8S", "11H 20M 33S", "12H 13M 45S"), 
      DetectTime = c("2017-05-29 18:50:43", "2017-06-05 08:09:48", "2017-05-24 21:57:32", "2017-05-30 08:44:03"))
df$Release.time <- hms(df$Release.time)


#   Squirrel.ID Release.time          DetectTime
#1       13097  13H 13M 18S 2017-05-29 18:50:43
#2       20948   10H 15M 8S 2017-06-05 08:09:48
#3       21853  11H 20M 33S 2017-05-24 21:57:32
#4       13088  12H 13M 45S 2017-05-30 08:44:03

解决方案:

library(lubridate)
df[df$Release.time - hms(strftime(df$DetectTime, format="%H:%M:%S")) >= "1H 30M",]

输出:

#  Squirrel.ID Release.time             DetectTime
#2       20948   10H 15M 8S    2017-06-05 08:09:48
#4       13088   12H 13M 45S   2017-05-30 08:44:03