How to select multiple elements of a list in R?

Generally, a list in R contains a large number of elements and each element can be of different type which is a great thing about lists. Since we can store type of data as a list element therefore storage and selection to different type of data becomes easier. And we can also select single or multiple elements of the list at a time. This can be done with the help of single square brackets.

Example

Consider the below list −

> list_data <- list("India", "China", c(21,32,11), letters[1:5], TRUE,
+ 12, letters[-c(1:10)], c(100,101,200,201), "USA", c("Asia", "Europe"),
+ "Education", "Poverty", "Covid-19", 365, 12, 24, 60, 7)
> list_data
[[1]]
[1] "India"
[[2]]
[1] "China"
[[3]]
[1] 21 32 11
[[4]]
[1] "a" "b" "c" "d" "e"
[[5]]
[1] TRUE
[[6]]
[1] 12
[[7]]
[1] "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"
[[8]]
[1] 100 101 200 201
[[9]]
[1] "USA"
[[10]]
[1] "Asia" "Europe"
[[11]]
[1] "Education"
[[12]]
[1] "Poverty"
[[13]]
[1] "Covid-19"
[[14]]
[1] 365
[[15]]
[1] 12
[[16]]
[1] 24
[[17]]
[1] 60
[[18]]
[1] 7

Selecting different elements of the list_data −

> list_data[c(1,2,3)]
[[1]]
[1] "India"
[[2]]
[1] "China"
[[3]]
[1] 21 32 11
> list_data[c(18,2,3)]
[[1]]
[1] 7
[[2]]
[1] "China"
[[3]]
[1] 21 32 11
> list_data[c(1,15,18)]
[[1]]
[1] "India"
[[2]]
[1] 12
[[3]]
[1] 7
> list_data[c(5,10,15)]
[[1]]
[1] TRUE
[[2]]
[1] "Asia" "Europe"
[[3]]
[1] 12
> list_data[c(7,3,10)]
[[1]]
[1] "k" "l" "m" "n" "o" "p" "q" "r" "s" "t" "u" "v" "w" "x" "y" "z"
[[2]]
[1] 21 32 11
[[3]]
[1] "Asia" "Europe"

Nizamuddin Siddiqui

Updated on: 11-Aug-2020

839 Views

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