向量级联函数结果上的有害排序行为 [英] Unwanted sorted behavior on result of vector-concatenation function

问题描述

我应用了一个简单的匿名函数以按序列1:5返回c(x，x + 5)

I apply a simple anonymous function to return c(x,x+5) on the sequence 1:5

我希望看到c(1,6,2,7,3,8,4,9,5,10)(子结果的串联)，但是结果向量被不必要地排序了.该怎么做，我该如何预防?

I expect to see c(1,6,2,7,3,8,4,9,5,10) (the concatenation of the subresults) but instead the result vector is unwantedly sorted. What is doing that and how do I prevent it?

> (function(x) c(x,x+5)) (1:5)
 [1]  1  2  3  4  5  6  7  8  9 10

但是将函数应用于每个单独的参数是正确的:

However applying the function on each individual argument is right:

> (function(x) c(x,x+5)) (1)
[1] 1 6
> (function(x) c(x,x+5)) (2)
[1] 2 7
...
> (function(x) c(x,x+5)) (5)
[1]  5 10

推荐答案

您可以尝试以此欺骗操作顺序:

You could try this to spoof the order of operations:

foo<-function(x) {   
      bar<-cbind(x,x+5)  
      as.vector(t(bar))

}
foo(1:5)

或以一种行格式:

(function(x) as.vector(t(cbind(x,x+5)))) (1:5)

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