如何重新排序级别

Question

我有以下数据框：

          Accession Order
1          CP000517  7
2          CP002081  8
3          CP002427  9
4          CP002429 10
5  CP002430_plasmid 11
6          CP003799 12
7          CP009907 13
8  CP009908_plasmid 14
9          CP011386 15
10         CP012381 16
11         CP016827 17
12              One 3
13      One_plasmid 4
14              Two 5
15      Two_plasmid 6
16            Three 1
17    Three_plasmid 2

现在我想根据第 "Order" 列进行排序。 "Accession" 的级别也必须具有此级别顺序...

Answer 1

我们只需要使用order

df2 <- df1[order(df1$Order),]
row.names(df2) <- NULL
df2$Accession <- factor(df2$Accession, levels = unique(df2$Accession))

或使用tidyverse

library(dplyr)
df1 %>%
   arrange(Order) %>%
   mutate(Accession = factor(Accession, levels = unique(Accession)))

或使用data.table

library(data.table)
setDT(df1)[order(Order)][, Accession := actor(Accession, levels = unique(Accession))]

如何重新排序级别

How to reorder levels

r

levels

dataframe