如何根据另一个向量的值对一个向量进行排序 [英] How do I sort one vector based on values of another

问题描述

我有一个向量x，我想根据向量y中值的顺序进行排序.这两个向量的长度不同.

I have a vector x, that I would like to sort based on the order of values in vector y. The two vectors are not of the same length.

x <- c(2, 2, 3, 4, 1, 4, 4, 3, 3)
y <- c(4, 2, 1, 3)

预期结果将是:

[1] 4 4 4 2 2 1 3 3 3

推荐答案

这是一个班轮...

y[sort(order(y)[x])]

[edit:]分解如下:

[edit:] This breaks down as follows:

order(y)             #We want to sort by y, so order() gives us the sorting order
order(y)[x]          #looks up the sorting order for each x
sort(order(y)[x])    #sorts by that order
y[sort(order(y)[x])] #converts orders back to numbers from orders

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