如何替换向量中多个值的多次出现

Question

我在data.frame中有一列，该列的每个唯一值都多次出现，因此需要用不同的值替换。我该如何实现？

我创建了唯一值的因子，并尝试使用gsub函数遍历因子水平来替换每个元素

nf <- factor(1, 2, 3, 4, 5, 6)
let <- c("a", "b", "c", "d", "e", "f")

dat <- c(1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6)

dat <- for (i in levels(nf)){
gsub(i,let[i], dat
}

我希望输出为：

"a" "b" "b" "c" "c" "c" "d" "d" "d" "d" "e" "e" "e" "e" "e" "f" "f" "f" "f" "f" "f" 

但是我却得到了：NULL。

Answer 1

你紧随其后

let[dat]
#[1] "a" "b" "b" "c" "c" "c" "d" "d" "d" "d" "e" "e" "e" "e" "e" "f" "f" "f" "f"
#[20] "f" "f"

或者，如果您更喜欢factor

factor(dat, labels = let)