订单如何运作？(How does order work? [duplicate])

订单如何运作？(How does order work? [duplicate])

这个问题在这里已有答案：

理解order（）函数 6个答案

这是一个非常尴尬的问题，但我无法理解以下结果：

> order(c(3,1,2)) [1] 2 3 1

那么，它是说有序序列是2, 3, 1 ？ 怎么样？

This question already has an answer here:

Understanding the order() function 6 answers

This is a very embarrassing question, but I cannot understand the result of the following:

> order(c(3,1,2)) [1] 2 3 1

So, it's saying the ordered sequence is 2, 3, 1? How?

最满意答案

> a <- c(30,10,20) # sample data > sort(a) # sort returns your vector sorted [1] 10 20 33 > order(a) # order returns the *indices* in the sorted vector [1] 2 3 1 > a[order(a)] # so if you select your numbers with those indices [1] 10 20 30 # you get your vector sorted > a <- c(30,10,20) # sample data > sort(a) # sort returns your vector sorted [1] 10 20 33 > order(a) # order returns the *indices* in the sorted vector [1] 2 3 1 > a[order(a)] # so if you select your numbers with those indices [1] 10 20 30 # you get your vector sorted