Convert an Object to List in R Programming as.list() Function (original) (raw)

Last Updated : 15 Jul, 2025

as.list() function in R Programming Language is used to convert an object to a list. These objects can be Vectors, Matrices, Factors, and dataframes.

Syntax: as.list(object)

Parameters:

object: Vector, Matrix, factor, or data frame

R - as.list() Function Example

Example 1: Converting Vector to list using as.list() function in R Language

R `

R program to convert object to list

Creating vector

x < - c(1, 2, 3, 4, 5)

Calling as.list() Function

as.list(x)

`

Output:

[[1]] [1] 1

[[2]] [1] 2

[[3]] [1] 3

[[4]] [1] 4

[[5]] [1] 5

Example 2: Converting data frame to list using as.list() function in R Language

R `

R program to convert object to list

Calling pre-defined data set

BOD

Calling as.list() Function

as.list(BOD)

`

Output:

Time demand 1 1 8.3 2 2 10.3 3 3 19.0 4 4 16.0 5 5 15.6 6 7 19.8 $Time [1] 1 2 3 4 5 7

$demand [1] 8.3 10.3 19.0 16.0 15.6 19.8

attr(, "reference") [1] "A1.4, p. 270"

Example 3: Converting matrix to list using as.list() function in R Language

R `

R program to create a matrix

and then convert into list

A = matrix(

Taking sequence of elements

c(1, 2, 3, 4, 5, 6, 7, 8, 9),

No of rows

nrow = 3,

No of columns

ncol = 3,

By default matrices are in column-wise order

So this parameter decides how to arrange the matrix

byrow = TRUE
)

Naming rows

rownames(A) = c("a", "b", "c")

Naming columns

colnames(A) = c("c", "d", "e")

cat("The 3x3 matrix:\n") print(A)

lst = as.list(A) lst

`

Output:

The 3x3 matrix: c d e a 1 2 3 b 4 5 6 c 7 8 9 [[1]] [1] 1

[[2]] [1] 4

[[3]] [1] 7

[[4]] [1] 2

[[5]] [1] 5

[[6]] [1] 8

[[7]] [1] 3

[[8]] [1] 6

[[9]] [1] 9