0
你有两个数据帧:数值与多个值匹配r中
df <- data.frame(A = c(1,1,2,2,3,3), B = c('cat','dog','cat','dog','cat','dog'), C = c(100,200,300,400,500,600))
df2 <- data.frame(A = c(1,1,1,1,2,2,2,2,3,3,3,3), B = c('cat','dog','cat','dog','cat','dog'))
输出DF1:
A B C
1 cat 100
1 dog 200
2 cat 300
2 dog 400
3 cat 500
3 dog 600
输出DF2:
A B
1 cat
1 dog
1 cat
1 dog
2 cat
2 dog
2 cat
2 dog
3 cat
3 dog
3 cat
3 dog
我知道如何搭配单值这样当'A'值在df和df2上匹配时,它会将该值添加到df2:
df2$match <- df$C[match(df2$A, df$A)]
输出:
A B match
1 cat 100
1 dog 100
1 cat 100
1 dog 100
2 cat 300
2 dog 300
2 cat 300
2 dog 300
3 cat 500
3 dog 500
3 cat 500
3 dog 500
你如何匹配多个值,这样当“A”和“B”是跨越DF和DF2相同的“C”的值相匹配?
你想'合并(DF,DF2)' – shayaa