How to Extract a Column from R DataFrame to a List ?

How to extract column from data frame as vector in R ?

Last Updated : 07 Apr, 2021

In this article, we are going to convert dataframe column into a vector in R Programming Language.

Steps –

Create vectors
Create a dataframe by passing these vectors
Convert dataframe column using“[[]]” operator (indexing). [[]] is used to access the dataframe column.It is used to index the dataframe.

Syntax:

dataframe_name[[‘column_name’]]

Display vectors

Example 1:

R

# creating a vector for names 
names=c('siva nagulu','bhavanarayana','sireesha', 
        'priyank chowdary','sridevi','ravi kumar') 
  
# creating a vector for ages 
ages=c(40,49,38,42,36,39) 
  
#create a dataframe using these vectors 
dataframe=data.frame(names,ages) 
print(dataframe) 
  
# converting ages dataframe column into vector 
# by passing as index 
my_data = dataframe[['names']] 
print("--------convert into vector of names column-------") 
print(my_data) 
  
my_data = dataframe[['ages']] 
print("--------convert into vector of ages column-------") 
print(my_data)

Output:

Example 2:

R

# creating a vector for city 
city=c('kakumanu','hyd','noida') 
  
# create a dataframe using this vector 
dataframe=data.frame(city) 
print(dataframe) 
  
# converting city dataframe column into vector 
# by passing as index 
my_data = dataframe[['city']] 
print("--------convert into vector of city column-------") 
print(my_data) 

Output:

How to Extract a Column from R DataFrame to a List ?

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