combine multiple rows into one time interval

问题

I have a data frame which is made up of the date and time a number of tagged animals visited a feeder. it looks like this -

ID    date_time                 
A     2019-11-02 08:07:47    
B     2019-11-02 08:07:48
A     2019-11-02 08:07:49
A     2019-11-02 08:07:50
A     2019-11-02 08:09:12
A     2019-11-02 08:09:13
B     2019-11-02 08:09:17

I'd like to lump all data points recorded within n seconds of each other into a single row so that it looks like this -

ID     start_date_time.      end_date_time
A      2019-11-02 08:07:47   2019-11-02 08:07:50
B      2019-11-02 08:07:48   2019-11-02 08:07:48
A      2019-11-02 08:09:12   2019-11-02 08:09:13
B      2019-11-02 08:09:17   2019-11-02 08:09:47

I have tried using Lubridate with no success.

Thanks

回答1:

Possibly you can do it this way (N = 10s):

library(tidyverse)

dat %>%
  group_by(ID) %>%
  mutate(
    events = cut(date_time, '10 s', labels = F)
    ) %>%
  group_by(events, add = T) %>%
  summarise(
    start_date_time = min(date_time), 
    end_date_time   = max(date_time)
    ) %>%
  ungroup() %>%
  select(-events)

# # A tibble: 4 x 3
#   ID    start_date_time     end_date_time      
#   <chr> <dttm>              <dttm>             
# 1 A     2019-11-02 08:07:47 2019-11-02 08:07:50
# 2 A     2019-11-02 08:09:12 2019-11-02 08:09:13
# 3 B     2019-11-02 08:07:48 2019-11-02 08:07:48
# 4 B     2019-11-02 08:09:17 2019-11-02 08:09:17

Data:

structure(list(
  ID = c("A", "B", "A", "A", "A", "A", "B"),
  date_time = structure(
    c(
      1572678467,
      1572678468,
      1572678469,
      1572678470,
      1572678552,
      1572678553,
      1572678557
    ),
    class = c("POSIXct", "POSIXt"),
    tzone = ""
  )
),
row.names = c(NA,-7L),
class = "data.frame")

来源：https://stackoverflow.com/questions/58938992/combine-multiple-rows-into-one-time-interval

标签

lubridate

rfid