R语言中replace函数的用法

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"