r - 使用 Slice 或 Stringr 更改 R 中字符串向量中特定字符串的位置？

Question

这是我的载体

my_vec <- letters

是否可以使用 slice (dplyr) 或者 stringr ?

这是一个简单的排列。

Answer 1

你可以自己构建一个“插入”函数:

insert <- function(x, i, j){
  tmp <- x[-i]
  c(tmp[1:(j-1)], x[i], tmp[j:length(tmp)])
}

insert(letters, 26, 3)
# [1] "a" "b" "z" "c" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t"
#[22] "u" "v" "w" "x" "y"

---

旧答案:您可以自己构建一个置换函数:

permute <- function(x, i, j) {
  x[c(i, j)] <- x[c(j, i)]
  x} 

permute(letters, 26, 3)
#[1] "a" "b" "z" "d" "e" "f" "g" "h" "i" "j" "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u"
#[22] "v" "w" "x" "y" "c"