在下面的列表中,我想保留每个项目的第一个值。
[[1]]
[1] "Avatar" "\xe6"
[[2]]
[1] "Pirates of the Caribbean: At World's End" "\xe6"
[[3]]
[1] "Spectre" "\xe6"
外观
[[1]]
[1] "Avatar"
[[2]]
[1] "Pirates of the Caribbean: At World's End"
[[3]]
[1] "Spectre"
答案 0 :(得分:1)
一个选项是lapply
lapply(lst1, `[`, 1)
或将first
与map
一起使用
library(purrr)
map(lst1, first)