Convert input to a factor — as

Compared to base R, when x is a character, this function creates levels in the order in which they appear, which will be the same on every platform. (Base R sorts in the current locale which can vary from place to place.) When x is numeric, the ordering is based on the numeric value and consistent with base R.

Usage

as_factor(x, ...)

# S3 method for factor
as_factor(x, ...)

# S3 method for character
as_factor(x, ...)

# S3 method for numeric
as_factor(x, ...)

# S3 method for logical
as_factor(x, ...)

Arguments

x: Object to coerce to a factor.
...: Other arguments passed down to method.

Details

This is a generic function.

Examples

# Character object
x <- c("a", "z", "g")
as_factor(x)
#> [1] a z g
#> Levels: a z g
as.factor(x)
#> [1] a z g
#> Levels: a g z

# Character object containing numbers
y <- c("1.1", "11", "2.2", "22")
as_factor(y)
#> [1] 1.1 11  2.2 22 
#> Levels: 1.1 11 2.2 22
as.factor(y)
#> [1] 1.1 11  2.2 22 
#> Levels: 1.1 11 2.2 22

# Numeric object
z <- as.numeric(y)
as_factor(z)
#> [1] 1.1 11  2.2 22 
#> Levels: 1.1 2.2 11 22
as.factor(z)
#> [1] 1.1 11  2.2 22 
#> Levels: 1.1 2.2 11 22