如何计算列表中的总元素

Question

I have a list.

x <- list(1:3, 4:5, 6:9)

> x
#[[1]]
#[1] 1 2 3

#[[2]]
#[1] 4 5

#[[3]]
#[1] 6 7 8 9

I need to find the total elements in the list which is 9 in this case. By using length(x) i get output as 3. I am sure there must be something simple solution to this. Any help would be appreciated.

Answer 1

You can use a combination of length and unlist .

x <- list(1:3, 4:5, 6:9)
length(unlist(x))
# [1] 9