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Check if a value or a logical expression is TRUE in R Programming - isTRUE() Function

Last Updated : 15 Jul, 2025

isTRUE() function in R Language is used to check whether a value or a logical expression is true or not.

Syntax: isTRUE(x) Parameters: x: logical or number-like vector

Example 1:

Python3 1==

# R Program to test whether
# an expression is TRUE

# Calling isTRUE() Function
isTRUE(1)
isTRUE(1>0)
isTRUE("a")

Output:

[1] FALSE
[1] TRUE
[1] FALSE

Example 2:

Python3 1==

# R Program to test whether
# an expression is TRUE

# Creating vectors
x <- c(1, 2)
y <- c(4, 5, 6, 7)

# Calling isTRUE() Function
isTRUE(x < y)
isTRUE(x && y)
isTRUE(x || y)

Output:

[1] FALSE
[1] TRUE
[1] TRUE

Comment

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