我有这种格式的数据
> data = data.table(id = 1:10, date = seq(as.Date("2016-01-01"), by = 1, length = 10))
> data
id date
1: 1 2016-01-01
2: 2 2016-01-02
3: 3 2016-01-03
4: 4 2016-01-04
5: 5 2016-01-05
6: 6 2016-01-06
7: 7 2016-01-07
8: 8 2016-01-08
9: 9 2016-01-09
10: 10 2016-01-10
我有另一个矩阵,它是我希望预先形成的查询/子集.
> query = data.table(id = c(1,4,7), date_start = c("2016-01-01", "2016-01-01", "2016-01-01"), date_end = c("2016-01-04", "2016-01-02", "2016-01-03"))
> query
id date_start date_end
1: 1 2016-01-01 2016-01-04
2: 4 2016-01-01 2016-01-02 …