// Tutorial //

Get the number of rows and columns in R

Published on August 3, 2022
Default avatar
By Safa Mulani
Developer and author at DigitalOcean.
Get the number of rows and columns in R

While we believe that this content benefits our community, we have not yet thoroughly reviewed it. If you have any suggestions for improvements, please let us know by clicking the “report an issue“ button at the bottom of the tutorial.

Hello, readers! In this article, we will be focusing on the concept of rows and columns in R i.e. get the number of rows and columns of an object in R programming, in detail.

So, let us begin!! :)

Be it a matrix or a data frame, we deal with the data in terms of rows and columns. In the data analysis field, especially for statistical analysis, it is necessary for us to know the details of the object i.e. the count of the rows and columns which represent the data values.

R programming provides us with some easy functions to get the related information at ease! So, let us have a look at it one by one.


The ncol() function in R programming

R programming helps us with ncol() function by which we can get the information on the count of the columns of the object.

That is, ncol() function returns the total number of columns present in the object.

Syntax:

ncol(object)

We need to pass the object that contains the data. Here, the object can be a data frame or even a matrix or a data set.

Example: 01

In the below example, we have created a matrix as shown below. Further, using ncol() function, we try to get the value of the number of columns present in the matrix.

rm(list = ls())
data = matrix(c(10,20,30,40),2,6)
print(data)
print('Number of columns of the matrix: ')
print(ncol(data))

Output:

> print(data)
     [,1] [,2] [,3] [,4] [,5] [,6]
[1,]   10   30   10   30   10   30
[2,]   20   40   20   40   20   40
> print('Number of columns of the matrix: ')
[1] "Number of columns of the matrix: "
> print(ncol(data))
[1] 6

Example 02:

Here, we have imported the Bank Loan Defaulter prediction dataset into the R environment using read.csv() function. You can find the dataset here!

Using ncol() function, we detect and extract the count of columns in the dataset.

rm(list = ls())
getwd()
#Load the dataset
dta = read.csv("bank-loan.csv",header=TRUE)
print('Number of columns: ')
print(ncol(dta))

Output:

Number of columns: 
9

The nrow() function in R programming

Having understood about columns, it’s now the time to discuss about the rows for an object.

R provides us nrow() function to get the rows for an object. That is, with nrow() function, we can easily detect and extract the number of rows present in an object that can be matrix, data frame or even a dataset.

Syntax:

nrow(object)

Example 01:

In this example, we have created a matrix using matrix() function in R. Further, we have performed the nrow() function to get the number of rows present in the matrix as shown–

rm(list = ls())
data = matrix(c(10,20,30,40),2,6)
print(data)
print('Number of rows of the matrix: ')
print(nrow(data))

Output:

> print(data)
     [,1] [,2] [,3] [,4] [,5] [,6]
[1,]   10   30   10   30   10   30
[2,]   20   40   20   40   20   40

"Number of rows of the matrix: "
[1] 2

Example 02:

Now, in this example, we have made use of the same Bank Load Defaulter dataset as mentioned the ncol() function section above!

Having loaded the dataset into the R environment, we make use of nrow() function to extract the number of rows present in the dataset.

rm(list = ls())
getwd()
#Load the dataset
dta = read.csv("bank-loan.csv",header=TRUE)
print('Number of rows: ')
print(nrow(dta))

Output:

"Number of rows: "
850

Conclusion

By this, we have come to the end of this topic. Feel free to comment below, in case you come across any question.

For more such posts related to R programming, Stay tuned with us.

Till then, Happy Learning!! :)


Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in our Questions & Answers section, find tutorials and tools that will help you grow as a developer and scale your project or business, and subscribe to topics of interest.

Sign up
About the authors
Default avatar
Developer and author at DigitalOcean.

Still looking for an answer?

Was this helpful?