R 如何按部分字符串（或第一个字）对数据帧排序

我对R非常陌生，我在自学基本操作

我想提出以下意见：

County   Population
ACounty, Alabama   106242
BCounty, Alabama   362845
ACounty, Texas   242342
BCounty, Texas   293729

我试过：

df<-df %>% arrange(County)
view(df)

---

您可以划分县和州，并根据州排列数据

library(dplyr)
library(tidyr)

df %>%
  separate(County, c('County', 'State'), sep = ",\\s*") %>%
  arrange(State) %>%
  unite(County, County, State, sep = ",")

---

在base R中，您可以通过删除所有内容直到逗号来仅保留状态信息，并使用

order

按状态排列数据

df[order(sub('.*,', '', df$County)), ]

---

我们可以做到这一点，而不需要分裂或团结

library(dplyr)
library(stringr)
df1 %>% 
    arrange(str_remove(County, ",.*"))
#            County Population
#1 ACounty, Alabama     106242
#2   ACounty, Texas     242342
#3 BCounty, Alabama     362845
#4   BCounty, Texas     293729

数据

df1
library(dplyr)
library(stringr)
df1 %>% 
    arrange(str_remove(County, ",.*"))
#            County Population
#1 ACounty, Alabama     106242
#2   ACounty, Texas     242342
#3 BCounty, Alabama     362845
#4   BCounty, Texas     293729

df1 <- structure(list(County = c("ACounty, Alabama", "BCounty, Alabama", 
"ACounty, Texas", "BCounty, Texas"), Population = c(106242L, 
362845L, 242342L, 293729L)), class = "data.frame", row.names = c(NA, 
-4L))