You can use one of the following methods to convert a list to a vector in R:

#use unlist() function new_vector <- unlist(my_list, use.names = FALSE) #use flatten_*() function from purrr library new_vector <- purrr::flatten(my_list)

The following examples show how to use each of these methods in practice with the following list:

#create list my_list <- list(A = c(1, 2, 3), B = c(4, 5), C = 6) #display list my_list $A [1] 1 2 3 $B [1] 4 5 $C [1] 6

**Example 1: Convert List to Vector Using unlist() Function**

The following code shows how to convert a list to a vector using the **unlist()** function:

#convert list to vector new_vector <- unlist(my_list) #display vector new_vector A1 A2 A3 B1 B2 C 1 2 3 4 5 6

Note that you can specify **use.names = FALSE** to remove the names from the vector:

#convert list to vector new_vector <- unlist(my_list, use.names = FALSE) #display vector new_vector [1] 1 2 3 4 5 6

**Example 2: Convert List to Vector Using flatten_* Function**

The following code shows how to convert a list to a vector using the family of flatten_* functions from the purrr package:

library(purrr) #convert list to vector new_vector <- flatten_dbl(my_list) #display vector new_vector [1] 1 2 3 4 5 6

The **flatten_dbl()** function specifically converts the list to a vector of type double.

Note that we could use **flatten_chr()** to convert a character list to a vector of type character:

library(purrr) #define character list my_char_list <- list(A = c('a', 'b', 'c'), B = c('d', 'e'), C = 'f') #convert character list to character vector new_char_vector <- flatten_chr(my_char_list) #display vector new_char_vector [1] "a" "b" "c" "d" "e" "f"

Check out this page for a complete list of the family of flatten_* functions.

**Note:** If you’re working with an extremely large list, the flatten_* functions will perform quicker than the unlist() function from base R.

**Additional Resources**

How to Convert List to a Data Frame in R

How to Convert Matrix to Vector in R

How to Convert Data Frame Column to Vector in R