合并/加入R

Question

我有两个数据框a和b我想要合并

a <- data.frame(g=c("1","2","2","3","3","3","4","4","4","4"),h=c("1","1","2","1","2","3","1","2","3","4"))

b <- data.frame(g=c("1","2","3","3","3","4","4","4","4","4"),i=c("1","2","3","2","1","2","3","4","5","6"))

g代表一个分组变量，h和i代表我要合并/加入的

> a
   g h
1  1 1
2  2 1
3  2 2
4  3 1
5  3 2
6  3 3
7  4 1
8  4 2
9  4 3
10 4 4

> b
   g i
1  1 1
2  2 2
3  3 3
4  3 2
5  3 1
6  4 2
7  4 3
8  4 4
9  4 5
10 4 6

a和b应合并在分组变量g的级别上，而h和i的相同值应放在一起（独立）它们出现在h / i）中的顺序和不相同的值应该组合一次（不是所有可能的组合）。

最终df看起来像是：

   g    h    i
1  1    1    1
2  2    1 <NA>
3  2    2    2
4  3    1    1
5  3    2    2
6  3    3    3
7  4    1 <NA>
8  4    2    2
9  4    3    3
10 4    4    4
11 4 <NA>    5
12 4 <NA>    6

我需要那个df来执行相关分析。

Answer 1

在merge上听起来像h==i，同时保留i，因此请创建一个新变量x来加入，并保持双方的加入结果（{{ 1}}）。给@Moody_Mudskipper一个大帽子：

all=TRUE

Answer 2

我们也可以使用dplyr

执行此操作

library(dplyr)
a %>% 
  mutate(x = h) %>%
  full_join(mutate(b, x = i)) %>%
  select(-x)