How to Round Numbers in R (5 Examples)

by Tutor Aspire January 17, 2023

You can use the following functions to round numbers in R:

round(x, digits = 0): Rounds values to specified number of decimal places.
signif(x, digits = 6): Rounds values to specified number of significant digits.
ceiling(x): Rounds values up to nearest integer.
floor(x): Rounds values down to nearest integer.
trunc(x): Truncates (cuts off) decimal places from values.

The following examples show how to use each of these functions in practice.

The following code shows how to use the round() function in R:

#define vector of data
data 
#round values to 1 decimal place
round(data, digits = 1)

[1] 0.3 1.0 2.7 5.0 8.9

The following code shows how to use the signif() function to round values to a specific number of significant digits in R:

#define vector of data
data 
#round values to 3 significant digits
signif(data, digits = 3)

[1] 0.30 1.03 2.67 5.00 8.91

The following code shows how to use the ceiling() function to round values up to the nearest integer:

#define vector of data
data 
#round values up to nearest integer
ceiling(data)

[1] 1 2 3 5 9

The following code shows how to use the floor() function to round values down to the nearest integer:

#define vector of data
data 
#round values down to nearest integer
floor(data)

[1] 0 1 2 5 8

The following code shows how to use the trunc() function to truncate (cut off) decimal places from values:

#define vector of data
data 
#truncate decimal places from values
trunc(data)

[1] 0 1 2 5 8