r - 从 data.frames 的嵌套列表中提取列名

Question

我有一个嵌套的 data.frames 列表，获取所有 data.frames 的列名的最简单方法是什么？

示例:

d = data.frame(a = 1:3, b = 1:3, c = 1:3)

l = list(a = d, list(b = d, c = d))

结果:

$a
[1] "a" "b" "c"

$b
[1] "a" "b" "c"

$c
[1] "a" "b" "c"

Answer 1

已经有几个答案了。但让我留下另一种方法。我用过 rapply2()在 rawr 包中。

devtools::install_github('raredd/rawr')
library(rawr)
library(purrr)

rapply2(l = l, FUN = colnames) %>% 
flatten

$a
[1] "a" "b" "c"

$b
[1] "a" "b" "c"

$c
[1] "a" "b" "c"