我们说我有一些类似的数据：
> dput(test1)
structure(list(User = c(95L, 95L, 95L, 95L, 95L, 95L, 95L, 95L,
95L, 95L, 95L, 95L, 95L, 95L, 95L, 95L, 95L, 113L, 113L, 113L,
113L, 113L, 116L, 116L, 116L, 116L, 116L, 116L, 116L, 116L, 116L,
116L, 116L, 116L, 116L, 116L, 116L, 116L, 116L, 116L, 116L, 123L,
123L, 123L, 123L, 123L, 123L, 123L, 123L, 123L, 123L, 123L, 123L,
123L, 123L, 123L, 123L, 123L, 123L, 123L, 123L, 123L, 123L, 123L,
123L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L,
135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L,
135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L, 135L,
135L, 135L, 135L), Daypart6 = c("Afternoon", "Dinner", "Breakfast",
"Lunch", "Lunch", "Lunch", "Dinner", "Dinner", "Breakfast", "Dinner",
"Lunch", "Dinner", "Dinner", "Breakfast", "Breakfast", "Breakfast",
"Breakfast", "Breakfast", "Lunch", "Lunch", "Breakfast", "Lunch",
"Dinner", "Dinner", "Dinner", "Dinner", "Dinner", "Dinner", "Dinner",
"Afternoon", "Afternoon", "Afternoon", "Afternoon", "Afternoon",
"Afternoon", "Afternoon", "Afternoon", "Afternoon", "Afternoon",
"Afternoon", "Afternoon", "Dinner", "Dinner", "Dinner", "Dinner",
"Dinner", "Dinner", "Afternoon", "Afternoon", "Afternoon", "Afternoon",
"Lunch", "Lunch", "Dinner", "Dinner", "Lunch", "Dinner", "Dinner",
"Dinner", "Dinner", "Lunch", "Lunch", "Lunch", "Lunch", "Lunch",
"Dinner", "Dinner", "Dinner", "Dinner", "Dinner", "Dinner", "Dinner",
"Dinner", "Dinner", "Dinner", "Dinner", "Dinner", "Dinner", "Dinner",
"Dinner", "Dinner", "Lunch", "Dinner", "Dinner", "Evening", "Dinner",
"Evening", "Dinner", "Evening", "Dinner", "Evening", "Evening",
"Dinner", "Lunch", "Dinner", "Dinner", "Evening", "Evening",
"Evening", "Dinner")), .Names = c("Code", "TimeOfDay"), sorted = "User", class = c("data.table",
"data.frame"), row.names = c(NA, -100L), .internal.selfref = <pointer: 0x2d98fd8>)
>
library(data.table)
test[,uniqueTOD:=paste(unique(TimeOfDay),collapse='/'),'Code']
我得到的东西真的像：
Breakfast/Dinner
Dinner/Breakfast
在python中，有一种方法可以使用集合制作无序的唯一集合。 R中有类似的东西吗？
注意：这是数据的子集，因此它可能没有像所描述的那样的唯一组合。数据仅用于结构目的。