You can use either the c() function or the append() function to combine two or more lists in R:
#combine two lists using c() combined <- c(list1, list2) #combine two lists using append() combined <- append(list1, list2)
Both functions will produce the same result.
The following examples show how to use this syntax in practice.
Example 1: Combine Two Lists
The following code shows how to combine two lists in R:
#define lists list1 <- list(2, 5, 6, 8) list2 <- list(A = 1:5, B = 3) #combine two lists into one combined <- c(list1, list2) #view combined list combined [[1]] [1] 2 [[2]] [1] 5 [[3]] [1] 6 [[4]] [1] 8 $A [1] 1 2 3 4 5 $B [1] 3
We can also use the length() function to get the length of the combined list:
#get length of combined list
length(combined)
[1] 6
We can also use the class() function to get the class of the combined list:
#get class of combined list
class(combined)
[1] "list"
Example 2: Combine More Than Two Lists
We can use similar syntax to combine more than two lists in R:
#define lists list1 <- list(2, 5, 6, 8) list2 <- list(A = 1:5, B = 3) list3 <- list(X = 'A', Y = 'B') #combine three lists into one combined <- c(list1, list2, list3) #view combined list combined [[1]] [1] 2 [[2]] [1] 5 [[3]] [1] 6 [[4]] [1] 8 $A [1] 1 2 3 4 5 $B [1] 3 $X [1] "A" $Y [1] "B"
Additional Resources
The following tutorials offer additional information about lists in R:
How to Create an Empty List in R
How to Append Values to List in R
How to Convert List to Matrix in R
How to Convert List to Vector in R