Intersection of Two Objects in R Programming – intersect() Function

In this article, we will discuss how we do the Intersection of Two Objects in R Programming Language using the intersect() function.

What is the intersect() Function?

intersect() function in R Programming Language is used to find the intersection of two Objects. This function takes two objects like Vectors, Dataframes, etc. as arguments and results in a third object with the common data of both objects.

Syntax: intersect(x, y)

Parameters:x and y: Objects with the sequence of items

Example 1: the intersection of two vectors

R

# R program to illustrate
# intersection of two vectors

# Vector 1
x1 <- c(1, 2, 3, 4, 5, 6, 5, 5)

# Vector 2
x2 <- c(2:4)

# Intersection of two vectors
x3 <- intersect(x1, x2)

print(x3)

Output:

[1] 2 3 4

Example 2: intersect() function with character vectors

R

#define two vectors
x <- c('A', 'B', 'C', 'D', 'E', 'F')
y <- c('C', 'D', 'E', 'F')

#find intersection between two vectors
intersect(x, y)

Output:

[1] "C" "D" "E" "F"

Example 3: The intersection of two data frames

R

# R program to illustrate
# the intersection of two data frames

# Data frame 1
data_x <- data.frame(x1 = c(2, 3, 4),
                    x2 = c(1, 1, 1))

# Data frame 2
data_y <- data.frame(y1 = c(2, 3, 4),
                    y2 = c(2, 2, 2))

# Intersection of two data frames
data_z <- intersect(data_x, data_y)

print(data_z)

Output:

$x1
[1] 2 3 4

Example 4: The intersection of two Matrix

R

# create matrix one
a1<- matrix(1:9,3,3)
a1
# create matrix secound
a2<-matrix(1:12,3,4)
a2
# intersect both metrix
intersect(a1,a2)

Output:

     [,1] [,2] [,3]
[1,]    1    4    7
[2,]    2    5    8
[3,]    3    6    9

     [,1] [,2] [,3] [,4]
[1,]    1    4    7   10
[2,]    2    5    8   11
[3,]    3    6    9   12

[1] 1 2 3 4 5 6 7 8 9