R-向符合特定条件的数据帧添加值

我有以下两个数据帧：

d <- data.frame(c1 = c("A","A","B","C","A","C","D","D"))

map <- data.frame(c1 = c("A","B","C","D"), c2 = c(12,14,16,25))

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非常感谢

使用名为

match

的函数：

d$match <- map$c2[match(d$c1,map$c1)]

d$match
d$match <- map$c2[match(d$c1,map$c1)]

d$match <- map$c2[d$c1]