[英]How do I create a vector of random dates between two time points in R?
start_date <- as.Date('2015-01-01')
end_date <- as.Date('2017-01-01')
set.seed(1984)
as.Date(sample( as.numeric(start_date): as.numeric(end_date), 10,
replace = T),
origin = '1970-01-01')
[1] "2016-04-27" "2015-11-16" "2015-10-01" "2015-08-31" "2016-06-23"
[6] "2016-09-23" "2015-01-24" "2015-11-24" "2016-08-30" "2015-06-07"
在我看來,像在生成隨機日期中一樣使用sample
和seq
函數似乎更直接:
set.seed(1984)
sample(seq(as.Date('2015-01-01'), as.Date('2017-01-01'), by = "day"), 10)
輸出 :
[1] "2016-04-27" "2015-11-16" "2015-09-30" "2015-08-30" "2016-06-20"
[6] "2016-09-19" "2015-01-24" "2015-11-21" "2016-08-23" "2015-06-05"
如果我們正在使用POSIXct類,並且希望隨機化小時,分鍾和秒,而不僅僅是日期:
set.seed(1984)
sample(seq(as.POSIXct('2015-01-01'), as.POSIXct('2017-01-01'), by = "sec"), 10)
輸出 :
[1] "2016-04-26 15:04:13 CEST" "2015-11-16 10:17:23 CET"
[3] "2015-09-30 22:50:41 CEST" "2015-08-30 23:17:49 CEST"
[5] "2016-06-23 04:49:01 CEST" "2016-09-22 14:37:58 CEST"
[7] "2015-01-24 17:04:13 CET" "2015-11-24 07:13:42 CET"
[9] "2016-08-29 16:13:13 CEST" "2015-06-06 21:29:18 CEST"
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