Check if an Object is a Call in R Programming - is.call() Function

Check if an Object is an Expression in R Programming - is.expression() Function

Last Updated : 24 Jun, 2020

is.expression() function in R Language is used to check if the object passed to it as argument is of the expression class.

Syntax: is.expression(object) Parameters: object: Object to be checked

Example 1:

Python3 1==

# R program to check if
# an object is an expression

# Creating an object
x <- "sin(pi / 2)"

# Printing value of the object
eval(x)

# Calling is.expression() function
is.expression(x)

Output:

[1] "sin(pi/2)"
[1] FALSE

Example 2:

Python3 1==

# R program to check if
# an object is an expression

# Creating an object
x <- expression(sin(pi / 2))

# Printing value of the object
eval(x)

# Calling is.expression() function
is.expression(x)

Output:

[1] 1
[1] TRUE

Check if an Object is a Call in R Programming - is.call() Function

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