Check if an Object is of Type Integer in R Programming - is.integer() Function

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

Last Updated : 12 Jun, 2020

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 <- list(c("Jan", "Feb", "Mar")) 
c <- list(matrix(c(1, 2, 3, 4, 5))) 
d <- list(list("green", 12.3)) 
  
# Calling is.list() function 
is.list(a) 
is.list(b) 
is.list(c) 
is.list(d) 

Output:

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

Example 2:

# R program to illustrate 
# is.list function 
  
# Initializing a data frame "Biochemical Oxygen 
# Data" data sets 
x <- BOD 
  
# Each row of the data frame is a list  
a <- x[2, ] 
  
# Each column of the data frame is not a list  
b <- x[, 1] 
  
# Calling is.list() function 
is.list(a) 
is.list(b) 

Output:

[1] TRUE
[1] FALSE

Check if an Object is of Type Integer in R Programming - is.integer() Function

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