How to check if a vector contains given value in R ?

We can check if a vector contains a given value using the %in% operator. For this, we have to create a vector with some values. And we have to read input from the user for what value to be checked. Or we can assign some value to a variable explicitly. Using the %in% operator with the below-given syntax we can find the element we are looking for.

Syntax :

value_to_be_checked %in% vector

The above operation only returns a boolean value that is true or false.

Steps –

• Create vector
• Set value to be searched
• Using the given syntax, search for the element in the vector
• If found print true
• Else false

Example 1 :

R

vec1 = c(1,2,3,4,5)

a = 1

a %in% vec1

Output :

TRUE

Example 2 :

R

vec1 = c("karthik", "nikhil", "sravan")

a = "karthik"

a %in% vec1

Output :

TRUE

Example 3 :

R

vec1 = c("karthik", "nikhil", "sravan")

a = "krishna"

a %in% vec1

Output :

FALSE