Convert dataframe column to list in R

• Difficulty Level : Basic
• Last Updated : 23 May, 2021

In this article, we will learn how to convert a dataframe into a list by columns in R Programming language. We will be using as.list() function, this function is used to convert an object to a list. These objects can be Vectors, Matrices, Factors, and data frames.

Syntax: as.list( object )

Parameter: Dataframe object in our case

After passing the complete dataframe as an input to the function, nothing much has to be done, the function will responsibly convert each column to a separate list, with column elements as elements of the list.

Example 1:

R

 df<-data.frame(c1=c(11:15),            c2=c(16:20),            c3=c(5:9),            c4=c(1:5))  print("Sample Dataframe")print (df)  list=as.list(df)  print("After Conversion of Dataframe into list")print(list)

Output:

 "Sample Dataframe"
c1 c2 c3 c4
1 11 16  5  1
2 12 17  6  2
3 13 18  7  3
4 14 19  8  4
5 15 20  9  5
 "After Conversion of Dataframe into list"
\$c1
 11 12 13 14 15
\$c2
 16 17 18 19 20
\$c3
 5 6 7 8 9
\$c4
 1 2 3 4 5

Example 2:

R

 df <- data.frame(sr_num = c(200, 400, 600),                memory=c(128,256,1024),                text = c("Geeks", "for", "Geeks"))  print("Sample Dataframe")print (df)  list=as.list(df)  print("After Conversion of Dataframe into list")print(list)

Output:

 "Sample Dataframe"
sr_num memory  text
1    200    128 Geeks
2    400    256   for
3    600   1024 Geeks
 "After Conversion of Dataframe into list"
\$sr_num
 200 400 600
\$memory
  128  256 1024
\$text
 Geeks for   Geeks
Levels: for Geeks

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