R 始终选择列表中的第一个元素 让我们考虑一下清单: x <- list(c(1), c(1,2), c(2,3,4)) x
这是否有效:R 始终选择列表中的第一个元素 让我们考虑一下清单: x <- list(c(1), c(1,2), c(2,3,4)) x,r,list,vector,extract,R,List,Vector,Extract,这是否有效: lapply(x, '[', 1) [[1]] [1] 1 [[2]] [1] 1 [[3]] [1] 2 sapply(x, '[', 1) [1] 1 1 2 现在我们在谈! lapply(x, '[', 1) [[1]] [1] 1 [[2]] [1] 1 [[3]] [1] 2 sapply(x, '[', 1) [1] 1 1 2
lapply(x, '[', 1)
[[1]]
[1] 1
[[2]]
[1] 1
[[3]]
[1] 2
sapply(x, '[', 1)
[1] 1 1 2
现在我们在谈!
lapply(x, '[', 1)
[[1]]
[1] 1
[[2]]
[1] 1
[[3]]
[1] 2
sapply(x, '[', 1)
[1] 1 1 2