R - trunc() Function

The R trunc() function is used to round the given number towards zero. It returns the nearest integral value with absolute value less than the argument. In special cases it returns the following:

• If the argument value is already an integer, then the result is the same as the argument.
• If the argument is NaN or infinity, then the result is the same as the argument.

Syntax

trunc(x)

Parameters

Return Value

Returns the integer value by rounding the specified number towards zero.

Example:

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

#operating on single element atomic vector
print(trunc(-1))
print(trunc(0.5))
print(trunc(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(trunc(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(trunc(m))

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

The output of the above code will be:

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

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

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

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