r - 以初始顺序获取索引

Question

> which(LETTERS %in% c("R","A"))
[1]  1 18

我怎样才能得到答案18 1，即初始向量中出现的顺序的索引？

score 6 · Accepted Answer

6

match(c("R","A"),LETTERS)

[1] 18  1

于 2012-12-10T08:30:14.803 回答

1 回答 1