r - 在自身上重复向量

Question

假设我有一个向量：

tt <- c("test", "this" "function")

我该怎么做才能将其转换为：

>tt "test AS test", "this AS this", "function AS function"

我尝试了几次粘贴，但无法完全得到我想要的。

Answer 1

paste被矢量化：

> tt <- c("test", "this", "function")
> paste(tt,"AS",tt)
[1] "test AS test"         "this AS this"         "function AS function"

Answer 2

你会想要使用sapply

> sapply(tt, function(X) paste0(X, " AS ", X))
                  test                   this               function 
        "test AS test"         "this AS this" "function AS function"