在R中使用兩個向量來創建一個新的

Question

所以這是一個很奇怪的問題，但我在R中有兩個向量：一個是ID的順序列表，另一個是我希望該ID出現在多少次新的矢量。

例如：

ids: A B C D 
times: 4 2 5 3 

，我想用

new: A A A A B B C C C C C D D D 

落得這是否有道理？

Answer 1

使用rep功能，如：

> rep(c('A', 'B', 'C', 'D'), times=c(4, 2, 5, 3)) 
[1] "A" "A" "A" "A" "B" "B" "C" "C" "C" "C" "C" "D" "D" "D" 

Answer 2

使用rep()

> rep(LETTERS[1:4], times = c(4,2,5,3)) 
[1] "A" "A" "A" "A" "B" "B" "C" "C" "C" "C" "C" "D" "D" "D" 

Answer 3

這當然是有道理的。

rep(c("A","B","C","D"),times=c(4,2,5,3)) 
[1] "A" "A" "A" "A" "B" "B" "C" "C" "C" "C" "C" "D" "D" "D"