如何在列表中间插入元素? [英] How to insert an element in the middle of a list?

问题描述

我有一个包含几个元素的列表，例如10.

I have a list with several elements, say 10.

testList <- split(1:10,1:10)

如何在列表中间(例如位置3)插入新元素?

How to insert a new element in the middle of the list, say at position 3?

遍历所有元素的蛮力方法行得通，但是只是想知道是否还有一种更优雅的方法?

The brute force way of looping through all the elements will work, but just wondering if there is a more elegant way of doing this?

推荐答案

我认为您正在寻找append函数:

I think the append-function is what you are looking for:

append(testList, list(x=42), 3)
$`1`
[1] 1

$`2`
[1] 2

$`3`
[1] 3

$x
[1] 42

$`4`
[1] 4
#snipped....

对于更复杂的列表，您可能会发现hte utils包中的modifyList函数是有用的.它允许有针对性的修改.

For more complex lists you might find the modifyList funciton in hte utils package to be of use. It allows targeted modifications.

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