How to find common rows between two dataframe in R?

In this article, we are going to find common rows between two dataframes in R programming language.

For this, we start by creating two dataframes. Dataframes in use:

Method 1: Using inner join

We can get the common rows by performing the inner join on the two dataframes. It is available in dplyr() package

Syntax:

inner_join(data1, data2)

where,

• data1 is the first dataframe
• data2 is the second dataframe

Example: R program to find the common rows in the two dataframes

R

# load the dplyr library
library("dplyr")

# create a dataframe with 3 columns for college1
data1 = data.frame(id=c(1, 2, 3),
                   name=c("sravan", "ojsawi", "rohith"),
                   dept=c("CS", "EC", "IT"))

print(data1)

# create a dataframe with 3 columns for college2
data2 = data.frame(id=c(1, 2, 3),
                   name=c("ramya", "ojsawi", "rohith"),
                   dept=c("Nech", "EC", "IT"))

print(data2)

# get the common rows by using inner join
inner_join(data1, data2)

Output:

Example: R program to get the common rows from the dataframes

R

# load the dplyr library
library("dplyr")

# create a dataframe with 3 columns for college1
data1 = data.frame(id=c(1, 2, 3, 4, 5),
                   name=c("sravan", "ojsawi", "rohith", "bobby", "gnanesh"),
                   dept=c("CS", "EC", "IT", "CS", "CS"))

print(data1)

# create a dataframe with 3 columns for college2
data2 = data.frame(id=c(1, 2, 3, 4),
                   name=c("ramya", "ojsawi", "rohith", "bobby"),
                   dept=c("Nech", "EC", "IT", "CS"))

print(data2)

# get the common rows by using inner join
inner_join(data1, data2)

Output:

Method 2 : Using intersect() function

This function is used to get the common rows from the dataframe. This function is available in the generics package so we need to import this package first.

library(“generics”)

Syntax:

generics::intersect(dataframe1, dataframe2)

where

• dataframe1 is the first dataframe
• dataframe2 is the second dataframe

Example: R program to get the common rows by using intersect() function

R

# load the dplyr library
library("dplyr")

# load generics library
library("generics")

# create a dataframe with 3 columns for college1
data1 = data.frame(id=c(1, 2, 3, 4, 5),
                   name=c("sravan", "ojsawi", "rohith", "bobby", "gnanesh"),
                   dept=c("CS", "EC", "IT", "CS", "CS"))

print(data1)

# create a dataframe with 3 columns for college2
data2 = data.frame(id=c(1, 2, 3, 4),
                   name=c("ramya", "ojsawi", "rohith", "bobby"),
                   dept=c("Nech", "EC", "IT", "CS"))

print(data2)

# get the common rows by using intersect
print(generics: : intersect(data1, data2))

Output: