我的目标是执行左连接intervals
哪里的bike_id
比赛和created_at
时间戳在records
在。。。之间start
and end
in the intervals
table
> class(records)
[1] "data.table" "data.frame"
> class(intervals)
[1] "data.table" "data.frame"
> records
bike_id created_at resolved_at
1 28780 2019-05-03 08:29:18 2019-05-03 08:35:37
2 28780 2019-05-03 21:05:28 2019-05-03 21:07:28
3 28780 2019-05-04 21:13:39 2019-05-04 21:15:40
4 28780 2019-05-07 17:24:20 2019-05-07 17:26:39
5 28780 2019-05-08 11:34:32 2019-05-08 12:16:44
6 28780 2019-05-08 23:38:39 2019-05-08 23:40:36
> intervals
bike_id start end id
1: 28780 2019-05-03 04:44:45 2019-05-03 16:58:56 1
2: 28780 2019-05-04 07:07:39 2019-05-04 14:48:29 2
3: 28780 2019-05-07 23:28:32 2019-05-08 12:56:24 3
4: 28780 2019-05-10 06:06:21 2019-05-10 13:12:08 4
5: 28780 2019-05-12 05:21:24 2019-05-12 11:35:52 5
6: 28780 2019-05-13 08:44:54 2019-05-13 12:28:31 6
在这种情况下,输出看起来像
> output
bike_id created_at resolved_at id
1 28780 2019-05-03 08:29:18 2019-05-03 08:35:37 1
2 28780 2019-05-03 21:05:28 2019-05-03 21:07:28 NULL
3 28780 2019-05-04 21:13:39 2019-05-04 21:15:40 NULL
4 28780 2019-05-07 17:24:20 2019-05-07 17:26:39 NULL
5 28780 2019-05-08 11:34:32 2019-05-08 12:16:44 NULL
6 28780 2019-05-08 23:38:39 2019-05-08 23:40:36 NULL
我尝试过使用该解决方案发布在这里 https://community.rstudio.com/t/tidy-way-to-range-join-tables-on-an-interval-of-dates/7881 using tidyverse
但这会导致R耗尽内存(尽管两个表中的记录量都只有100K左右)
fuzzy_left_join(
records, intervals,
by = c(
"bike_id" = "bike_id",
"created_at" = "start",
"created_at" = "end"
),
match_fun = list(`==`, `>=`, `<=`)
) %>%
select(id, bike_id = bike_id.x, created_at, start, end)
这会引发错误:Error: vector memory exhausted (limit reached?)
是否有滚动加入的替代方法data.table
甚至在基本 R 中使用merge()
?通过 id 连接两个数据帧以及连接表中其他两个数据帧之间的时间戳的好方法是什么?
这是数据
dput(intervals)
structure(list(bike_id = c(28780L, 28780L, 28780L, 28780L, 28780L,
28780L), start = structure(c(1556858685, 1556953659, 1557271712,
1557468381, 1557638484, 1557737094), class = c("POSIXct", "POSIXt"
), tzone = "UTC"), end = structure(c(1556902736, 1556981309,
1557320184, 1557493928, 1557660952, 1557750511), class = c("POSIXct",
"POSIXt"), tzone = "UTC"), id = c(1, 2, 3, 4, 5, 6)), row.names = c(NA,
-6L), class = c("data.table", "data.frame"), .internal.selfref = <pointer: 0x1030056e0>)
dput(records)
structure(list(bike_id = c(28780L, 28780L, 28780L, 28780L, 28780L,
28780L), created_at = structure(c(1556872158.796, 1556917528.845,
1557004419.928, 1557249860.939, 1557315272.396, 1557358719.333
), class = c("POSIXct", "POSIXt"), tzone = "UTC"), resolved_at = structure(c(1556872537.867,
1556917648.118, 1557004540.056, 1557249999.892, 1557317804.183,
1557358836.202), class = c("POSIXct", "POSIXt"), tzone = "UTC")), row.names = c(NA,
6L), class = "data.frame")