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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



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