How to add column to dataframe in R ? (original) (raw)

Last Updated : 26 Mar, 2021

In this article, we are going to see how to add columns to dataframe in R. First, let's create a sample dataframe.

Adding Column to the DataFrame

We can add a column to a data frame using $ symbol.

syntax: dataframe_name $ column_name = c( value 1,value 2 . . . , value n)

Here c() function is a vector holds values .we can pass any type of data with similar type.

Steps for adding a column to a dataframe.

1. Create a data frame.
2. Use the $ symbol as shown in the above syntax to add a column to a data frame.
3. Print the updated data frame to see the changes.

Example 1: Creating a data frame.

R `

Creating a data frame with eid , ename,salary as columns

df2 = data.frame(eid = c(1, 2, 3), ename = c("karthik", "nikhil", "sravan"), salary = c(50000, 60000, 70000))

printing the data frame

print(df2)

`

Adding a column using $ symbol:

R `

creating a data frame

df2 = data.frame(eid = c(1, 2, 3), ename = c("karthik", "nikhil", "sravan"), salary = c(50000, 60000, 70000))

adding a new column to the data frame using $ symbol

df2$designation = c("data scientist", "senior manager", "HR")

printing the updated data frame

print(df2)

`

Example 2: Creating a data frame

R `

creating a data frame using vectors

df1 = data.frame(id = c(1, 2 ,3), name = c("karthik", "nikhil", "sravan"))

printing the data frame

print(df1)

`

Adding a column to the data frame

R `

creating a data frame

df1 = data.frame(id = c(1, 2, 3), name = c("karthik", "nikhil", "sravan"))

adding a new column to the data frame using $ symbol

df1$branch = c("IT", "CSE", "IT")

printing the updated data frame

print(df1)

`