我有这样的数据集:
say $subs -> {aa} -> () -> [1] -> [1]
我想创建一个for循环,根据Unique ID#,我想订购date_time列并按升序排列值1。所以它看起来像这样:
ID Conversion date_time
1 0 22/08/2016 00:28
1 1 22/08/2016 00:09
2 0 22/08/2016 00:50
2 0 22/08/2016 00:52
2 0 22/08/2016 00:11
提前谢谢
答案 0 :(得分:0)
使用data.table
:
df <- read.table(header=T, text="ID Conversion date_time
1 0 22/08/201600:28
1 1 22/08/201600:09
2 0 22/08/201600:50
2 0 22/08/201600:52
2 0 22/08/201600:11")
library(data.table)
setDT(df)
df[, date_time1 := 1:.N, by = ID]
df[, date_time := NULL]
setnames(df, "date_time1", "date_time")
ID Conversion date_time
1: 1 0 1
2: 1 1 2
3: 2 0 1
4: 2 0 2
5: 2 0 3