Get the number of columns of an Object in R Programming - ncol() Function

Last Updated : 15 Jul, 2025

ncol() function in R Language is used to return the number of columns of the specified matrix.
 

Syntax: ncol(x)
Parameters: 
x: matrix, vector, array or data frame 
 


Example 1: 
 

Python3 
# R program to illustrate
# ncol function

# Getting R Biochemical Oxygen Demand Dataset
BOD 

# Calling ncol() function to
# get the number of columns
ncol(BOD)

Output: 
 

  Time demand
1    1    8.3
2    2   10.3
3    3   19.0
4    4   16.0
5    5   15.6
6    7   19.8

[1] 2


Example 2: 
 

Python3 
# R program to illustrate
# ncol function

# Specifying a matrix
x <- matrix(c(1, 2, 3, 4), 2, 2)

# Calling the ncol() function
ncol(x)

Output: 
 

[1] 2


 

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