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

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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:




# 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:




# 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

Last Updated : 24 Jun, 2020
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