r - R：如何将向量扩展为更大的长度以保持其唯一值？

Question

假设我们有一个像下面这样的向量：

countries <- c("UK", "Germany", "Italy", "Denmark")

我想从中创建另一个，但更长，如下所示：

countries_long <- c("UK", "UK", "UK", "UK", "Germany", "Germany", "Italy", "Italy", "Denmark", "Denmark", "Denmark")

我怎样才能达到这个结果？

标签： r

Answer 1

> rep(countries, c(4,2,2,3))
 [1] "UK"      "UK"      "UK"      "UK"      "Germany" "Germany" "Italy"   "Italy"   "Denmark" "Denmark" "Denmark"
>