Consider the vectors below:
考虑下面的向量:
ID <- c("A1","B1","C1","A12","B2","C2","Av1")
names <- c("ALPHA","BRAVO","CHARLIE","AVOCADO")
ID <-
阅读背景：
根据字符串的第一个字母替换向量中的元素
来源：互联网
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