r - 为什么sample()不适用于单个数字？

Question

这个问题已经有答案了:

Sample from vector of varying length (including 1) (4 个回答)

已关闭 4 年前。

sample(x,n)参数是向量，以及您希望采样的次数

sample(c(5,9),1) returns either 5 or 9

但是，

sample(5,1) returns 1,2,3,4, or 5?

我已阅读帮助部分:

If x has length 1, is numeric (in the sense of is.numeric) and x >= 1, sampling via sample takes place from 1:x. Note that this convenience feature may lead to undesired behaviour when x is of varying length in calls such as sample(x). See the examples.

但是有没有办法让它不这样做呢？或者我是否只需要包含一个 if 语句来避免这种情况。

Answer 1

Or do I just need to include an if statement to avoid this.

是的，不幸的是。像这样的事情:

result = if(length(x) == 1) {x} else {sample(x, ...)}