如何在R中的for循环中向字符向量添加索引

# 创建一个字符向量
characters <- c("apple", "banana", "cherry")

# 创建一个空的字符向量，用于存储带有索引的字符
indexed_characters <- c()

# 使用for循环遍历字符向量，并添加索引
for (i in 1:length(characters)) {
  indexed_character <- paste(i, characters[i], sep = ": ")
  indexed_characters <- c(indexed_characters, indexed_character)
}

# 打印带有索引的字符向量
print(indexed_characters)

[1] "1: apple"   "2: banana"  "3: cherry"