我有一个像这样的数据框:
V1 V2 V3
AAA x 2
AAA x 5
AAA y 7
BBB y 7
BBB x 8
BBB y 3
我想总结来自V3的值,具体取决于V1 并得到一个像这样的数据帧:
V1 V2 V3
AAA x 7
AAA y 7
BBB x 8
BBB y 10
感谢您的帮助!
答案 0 :(得分:1)
使用sqldf
。按v1,v2
分组并按以下步骤进行sum(v3)
:
library(sqldf)
sqldf("select V1,V2,sum(V3) from df group by V1,V2")
输出:
V1 V2 sum(V3)
1 AAA x 7
2 AAA y 7
3 BBB x 8
4 BBB y 10
答案 1 :(得分:0)
数据集
dt <- data.frame(V1=c("AAA","AAA","AAA","BBB","BBB","BBB"),
V2=c("x","x","y","y","x","y"),
V3=c(2,5,7,7,8,3))
dt
代码:
library(tidyverse)
dt %>%
group_by(V1,V2) %>%
mutate( Sum= sum(V3))