R语言 把无序因子转换成有序因子 – as.ordered() 函数

R语言中的 as.ordered() 函数将一个无序因子作为参数，并将其转换为一个有序因子。

语法： as.ordered( factor)

参数：

factor： 要转换的无序因子

例子 1 :

# Creating a vector 
x<-c("North", "North", "East", "West") 
  
# Converting vector into factor
Directions <- factor(x)
  
# Using as.ordered() Function
# to order an unordered factor
as.ordered(Directions)

输出

[1] North North East  West 
Levels: East < North < West

例2 :

# creating vector size 
size = c("small", "large", "large", "small",  
         "medium", "large", "medium", "medium")   
sizes <- ordered(c("small", "large", "large", 
                   "small", "medium")) 
    
# Using as.ordered() Function
# to order an unordered factor
as.ordered(sizes)

输出

[1] small  large  large  small  medium
Levels: large < medium < small