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R - round() Function



The R round() function rounds the values in its first argument to the specified number of decimal places (default 0). In special cases it returns the following:

  • If the argument is NaN or infinity, then the result is the same as the argument.

Syntax

round(x, digits)

Parameters

x Required. Specify column to round off.
digits Optional. Specify number of decimal places to which value has to be round off. Default is 0.

Return Value

Returns the integral value that is nearest to the argument value.

Example: Rounding off the values

In the example below, round() function is used to round the specified number.

#operating on single element atomic vector
print(round(-1))
print(round(0.5))
print(round(2.0))

cat("\nOperating on vector\n")
#operating on vector
v <- c(10.3, 10.5, 10.7, -10.3, -10.5, -10.7)
print(round(v))

cat("\nOperating on matrix\n")
#operating on matrix
m <- matrix(c(-10.3, -10.5, -10.7, 100.2, Inf, NaN), nrow=2)
print(round(m))

cat("\nOperating on first column of matrix\n")
#operating on first column of matrix
print(round(m[,1]))

The output of the above code will be:

[1] -1
[1] 0
[1] 2

Operating on vector
[1]  10  10  11 -10 -10 -11

Operating on matrix
     [,1] [,2] [,3]
[1,]  -10  -11  Inf
[2,]  -10  100  NaN

Operating on first column of matrix
[1] -10 -10

Example: Rounding off to certain decimal places

Consider one more example where a numeric vector is rounded off to 2 decimal places.

#creating a vector
v <- c(10.33333, 10.567, 10.7, -10.35, -10.534, 10/3)

#printing the vector after rounding 
#off to 2 decimal places
print(round(v, 2))

The output of the above code will be:

[1]  10.33  10.57  10.70 -10.35 -10.53   3.33

❮ R Math Functions

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