1、
> a <- letters[1:10]
> a
[1] "a" "b" "c" "d" "e" "f" "g" "h" "i" "j"
> replace(a, c(1, 3, 5), "xxx") ## 替换指定索引的字符串为特定的字符串
[1] "xxx" "b" "xxx" "d" "xxx" "f" "g" "h" "i" "j"
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