为什么 R 中的 sort 与 mutate 表现不佳？

Question

我的数据的列名称为 Hosts，有 11 个主机名称。

当我使用

sort(unique(Hosts)

时，它会按字母顺序对主机进行排序。但是，当我想要

factor

主机与

mutate

时，它不会按字母顺序排序。谁能帮我解决为什么

sort

不使用

mutate

按字母顺序对主机进行排序吗？或者我的代码有问题吗？

这是单独使用排序时的输出：

> sort(unique(Hosts)) [1] "Artificialdiet" "Castor"         "Cotton"         "Cowpea"         "Maize"          [6] "Pearlmillet"    "Rice"           "Sorghum"        "Soybean"        "Sunflower"      [11] "Tomato"

df <- df |> mutate(Hosts = factor(Hosts, labels = sort(unique(Hosts))))

这是输出：

$ Hosts: Factor w/ 11 levels "Soybean","Castor",..: 1 1 1 1 1 1 1 1 1 1 ...

11 Levels: Soybean Castor Sorghum Cowpea Maize Rice Pearlmillet Sunflower Cotton ... Artificialdiet

Answer 1

您可以使用

ordered

参数

library(tidyverse)

df <- tibble(Hosts = c("Artificialdiet", "Castor", "Cotton", "Cowpea", "Maize",
                  "Pearlmillet", "Rice", "Sorghum", "Soybean", "Sunflower", "Tomato"))

df %>% 
  mutate(Hosts = factor(Hosts, ordered = TRUE))  

# A tibble: 11 × 1
   Hosts         
   <ord>         
 1 Artificialdiet
 2 Castor        
 3 Cotton        
 4 Cowpea        
 5 Maize         
 6 Pearlmillet   
 7 Rice          
 8 Sorghum       
 9 Soybean       
10 Sunflower     
11 Tomato   

Rows: 11
Columns: 1
$ Hosts <ord> Artificialdiet, Castor, Cotton, Cowpea, Maize, Pearlmillet, Rice, Sorghum, Soybean, Sunflower, …