对R中的列表列表进行排序:根据其他列表的值对一个列表的值进行排序 [英] Sort list of lists in R: sort one lists' value depending on other lists' value

问题描述

我需要一些有关列表列表排序的帮助.假设我列出了以下孩子:

I need some help with sorting a list of lists. Suppose I have a list of children given as following:

a <- list(name = "Ann", age = 9)
b <- list(name = "Bobby", age = 17)
c <- list(name = "Alex", age = 6)

my.list <- list(a, b, c)

我想按年龄对他们的名字进行排序，因此请获得以下信息:

I would like to sort their names by their age, so receive the following:

> "Alex" "Ann" "Bobby"

推荐答案

a <- list(name = "Ann", age = 9)
b <- list(name = "Bobby", age = 17)
c <- list(name = "Alex", age = 6)

L <- list(a,b,c)
ages <- sapply(L,"[[","age")
names <- sapply(L,"[[","name")
names[order(ages)]

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