我目前要做的是将所有列分散到多个列上,例如此数据框
Person_ID Car_ID Car_Type Car_Speed
a 1 x 50
a 2 y 70
a 3 z 100
b 4 y 70
我想把它变成这个
Person_ID Car_ID1 Car_Type1 Car_Speed1 Car_ID2 Car_Type2 Car_Speed2 Car_ID3 Car_Type3 Car_Speed3
a 1 x 50 2 y 70 3 z 100
b 4 y 70
有人可以帮忙吗?谢谢。
答案 0 :(得分:2)
使用来自dcast
的{{1}}可以轻松完成此操作,这可能需要多个data.table
列
value.var
或创建按' Person_ID'
分组的序列列后,library(data.table)#v1.9.7+
dcast(setDT(df1), Person_ID~rowid(Person_ID),
value.var = c("Car_ID", "Car_Type", "Car_Speed"))
# Person_ID Car_ID_1 Car_ID_2 Car_ID_3 Car_Type_1 Car_Type_2 Car_Type_3 Car_Speed_1 Car_Speed_2
#1: a 1 2 3 x y z 50 70
#2: b 4 NA NA y NA NA 70 NA
# Car_Speed_3
#1: 100
#2: NA
来自reshape
base R