In this article, we will see how to order factor values in the R programming language.
We can order Factor values using the as.ordered() method. It is available in dplyr() package. So we have to load this package.
Syntax:
library(dplyr)Â
Syntax:
as.ordered(factor_data)
Example 1 :
In this example, we will create a factor with 6 strings and order the values.
library(dplyr)
# create factor data with 5 strings
factor_data < - as.factor(c("sravan", "sravan", "bobby",
"pinkey", "sravan"))
# display before ordering
print(factor_data)
# display after ordering
print(as.ordered(factor_data))
Output:
[1] sravan sravan bobby pinkey sravan Levels: bobby pinkey sravan [1] sravan sravan bobby pinkey sravan Levels: bobby < pinkey < sravan
Example 2 :
In this example, we will create a factor with 6 integer elements and order the values.
library(dplyr)
# create factor data with 5 numeric values
factor_data < - as.factor(c(1, 2, 3, 2, 3))
# display before ordering
print(factor_data)
# display after ordering
print(as.ordered(factor_data))
Output:
[1] 1 2 3 2 3 Levels: 1 2 3 [1] 1 2 3 2 3 Levels: 1 < 2 < 3
We can also check whether the values in a factor are ordered or not. The is.ordered() is used to check it. It will return TRUE if the factor values are ordered. Otherwise, it will return FALSE.
Syntax:
is.ordered(factor_data)
Example:
Check whether the factor values are ordered or not.
library(dplyr)
# create factor data with 5 numeric values
factor_data < - as.factor(c(1, 2, 3, 2, 3))
# check values are ordered or not
# before ordering
print(is.ordered(factor_data))
# order the values
order = as.ordered(factor_data)
# check values are ordered or not
# after ordering
print(is.ordered(order))
Output:
[1] FALSE [1] TRUE
