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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

x Required. Specify column to compute on.

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

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