Check if an Object is an Expression in R Programming – is.expression() Function Improve Improve Like Article Like Save Share Report 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 Like Article Save Article Previous Generate all Combinations of xCm in R Programming - combn() Function Next Convert a String to an Expression in R Programming - parse() Function Share your thoughts in the comments Add Your Comment Please Login to comment...