根据另一个数据框中的日期添加数据

Question

我有两个数据集。一个有多个日期：

date, time
1   2013-05-01 12:43:34
2   2013-05-02 05:04:23
3   2013-05-02 09:34:34
4   2013-05-02 12:32:23
5   2013-05-03 23:23:23
6   2013-05-04 15:34:17

还有一个有日出和日落数据：

Sunrise                Sunset 
2013-05-01 06:43:00    2013-05-01  21:02:12
2013-05-02 06:44:00    2013-05-02  21:03:13
2013-05-03 06:44:56    2013-05-03  21:04:02
2013-05-04 06:45:32    2013-05-04  21:05:00

我想根据第一个数据帧的日期和时间是否在日出和日落时间和日期之间，向第一个数据帧添加一列“日”或“夜”。

date, time                 Day or night
1   2013-05-01 12:43:34    Day
2   2013-05-02 05:04:23    Night
3   2013-05-02 09:34:34    Day
4   2013-05-02 12:32:23    Day
5   2013-05-03 23:23:23    Night
6   2013-05-04 15:34:17    Day

我尝试了复制和 if_else 功能，但行的长度不同，因为一年我有 365 次日出和日落，但我也有一天的多次测量（总共 28000 行） .

谁能帮我解决我的问题。提前致谢。

Answer 1

df1 <- structure(list(date_time = c("2013-05-01 12:43:34", "2013-05-02 05:04:23", 
"2013-05-02 09:34:34", "2013-05-02 12:32:23", "2013-05-03 23:23:23", 
"2013-05-04 15:34:17")), row.names = c(NA, -6L), class = c("data.frame"))

df2 <- structure(list(Sunrise = c("2013-05-01 06:43:00", "2013-05-02 06:44:00", 
"2013-05-03 06:44:56", "2013-05-04 06:45:32"), Sunset = c("2013-05-01 21:02:12", 
"2013-05-02 21:03:13", "2013-05-03 21:04:02", "2013-05-04 21:05:00"
)), row.names = c(NA, -4L), class = c("data.frame"))

# prepare df1
df1 <- df1 %>%
  mutate(date_time = as.POSIXct(date_time, tz = "UTC")) %>%
  mutate(Date = as.Date(date_time))

# prepare df2
df2 <- df2 %>%
  mutate(Sunrise = as.POSIXct(Sunrise, tz = "UTC")) %>%
  mutate(Sunset = as.POSIXct(Sunset, tz = "UTC")) %>%
  mutate(Date = as.Date(Sunrise))

library(lubridate) # for the use of interval

merge(df1, df2, by = "Date") %>%
  mutate(DayOrNight = ifelse(date_time %within% interval(Sunrise, Sunset), "Day", "Night"))

#         Date           date_time             Sunrise              Sunset DayOrNight
# 1 2013-05-01 2013-05-01 12:43:34 2013-05-01 06:43:00 2013-05-01 21:02:12        Day
# 2 2013-05-02 2013-05-02 05:04:23 2013-05-02 06:44:00 2013-05-02 21:03:13      Night
# 3 2013-05-02 2013-05-02 09:34:34 2013-05-02 06:44:00 2013-05-02 21:03:13        Day
# 4 2013-05-02 2013-05-02 12:32:23 2013-05-02 06:44:00 2013-05-02 21:03:13        Day
# 5 2013-05-03 2013-05-03 23:23:23 2013-05-03 06:44:56 2013-05-03 21:04:02      Night
# 6 2013-05-04 2013-05-04 15:34:17 2013-05-04 06:45:32 2013-05-04 21:05:00        Day

根据另一个数据框中的日期添加数据

Adding data based on date from another dataframe

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