Convert a String to an Expression in R Programming - parse() 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:

# 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

Convert a String to an Expression in R Programming - parse() Function

N

nidhi_biet

Improve

Article Tags :

Similar Reads

Create an Expression in R Programming - expression() Function

expression() function in R Language is used to create an expression from the values passed as argument. It creates an object of the expression class. Syntax: expression(character) Parameters: character: Expression, like calls, symbols, constants Example 1: # R program to create an expression # Calli

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

is.call() function in R Language is used to determine whether x is a call or not. Syntax: is.call(x) Parameters: x: an arbitrary R object Example 1: # R program to illustrate # is.call function # Calling is.call() function is.call(call) Output: [1] FALSE Example 2: # R program to illustrate # is.cal

Check if an Object is a Table in R Programming - is.table() Function

is.table() function in R Language is used to check if an object is a table. Syntax: is.table(x) Parameters: x: Object to be checked Example 1: # R Program to check # if an object is a table # Creating a vector vec = c(2, 4, 3, 1, 2, 3, 2, 1, 4, 2) # calling is.table() Function is.table(vec) # Conver

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

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: # R Program to test whether # an expression is TRUE # Calling isTRUE() Function isTRUE(1) isTRUE(1>0) isTRUE("a

Checking if the Object is a Factor in R Programming - is.factor() Function

is.factor() function in R Language is used to check if the object passed to the function is a Factor or not. It returns a boolean value as output. Syntax: is.factor(Object) Parameters: Object: Object to be checked Example 1: # Creating a vector x<-c("female", "male", "mal

Check if the Object is a Data Frame in R Programming - is.data.frame() Function

is.data.frame() function in R Language is used to return TRUE if the specified data type is a data frame else return FALSE. R data.frame is a powerful data type, especially when processing table (.csv). It can store the data as row and columns according to the table. Syntax: is.data.frame(x) Paramet

Check if an Object is of Complex Data Type in R Programming - is.complex() Function

is.complex() function in R Language is used to check if the object passed to it as argument is of complex data type. Syntax: is.complex(x) Parameters: x: Object to be checked Example 1: # R program to check if # object is of complex type # Calling is.complex() function is.complex(1 + 0i) is.complex(

Check if the Object is a List in R Programming - is.list() Function

is.list() function in R Language is used to return TRUE if the specified data is in the form of list, else returns FALSE. Syntax: is.list(X) Parameters: x: different types of data storage Example 1: # R program to illustrate # is.list function # Initializing some list a <- list(1, 2, 3) b <- l

Check if an Object is of Type Character in R Programming - is.character() Function

is.character() function in R Language is used to check if the object passed to it as argument is of character type. Syntax: is.character(x) Parameters: x: Object to be checked Example 1: # R program to check if # object is a character # Creating a vector x1 <- 4 x2 <- c("a", "b

Check if a Function is a Primitive Function in R Programming - is.primitive() Function

is.primitive() function in R Language is used to check if a function is a primitive function, i.e. its either a built-in function or a special function. Syntax: is.primitive(func) Parameters: func: Function to be checked Example 1: # R program to illustrate # the use of is.primitive function # Calli