当元素被斜杠分隔时匹配两个表的列

Question

我有一个如下所示的数据框：

Names	Identification
Animals	15/20/25/26
Fruits	1/2/3/4

另一个数据框如下所示：

Id	Identification
Cat	15
Dog	20
Elephant	25
Mouse	26
Banana	1
Melon	2
Mango	3
Apple	4

我想匹配第一个 table 到第二个的识别码，以在原来的 table:

中创建一个新列

Names	Identification	Id
Animals	15/20/25/26	Cat/Dog/Elephant/Mouse
Fruits	1/2/3/4	Banana/Melon/Mango/Apple

这是 table 的代码：


original <- data.frame(
    Names = c('Animals', 'Fruits'),
    Identification = c('15/20/25/26', '1/2/3/4')
)


to_match <- data.frame(
    Id = c('Cat', 'Dog', 'Elephant', 'Mouse','Banana', 'Melon', 'Mango','Apple'),
    Identification = c(15,20,25,26,1,2,3,4)
)

这是我试过的方法，由于斜线的缘故，它不起作用。

original$Id <- to_match$Id[match(original$Identifcation, to_match$Identification),]

如有任何帮助，我们将不胜感激。

Answer 1

您可以使用separate_rows然后再次分组：

library(tidyverse)

a <- read.table(text = "Names   Identification
Animals 15/20/25/26
Fruits  1/2/3/4", header = T)

b <- read.table(text = "Id  Identification
Cat 15
Dog 20
Elephant    25
Mouse   26
Banana  1
Melon   2
Mango   3
Apple   4", header = T)

a %>%
  separate_rows(Identification) %>%
  left_join(b %>%
              mutate_all(as.character), by = "Identification") %>%
  group_by(Names) %>%
  summarise(Identification = str_c(Identification, collapse = "/"),
            Id = str_c(Id, collapse =  "/"), 
            .groups = "drop")

# # A tibble: 2 x 3
# Names   Identification Id                      
# <chr>   <chr>          <chr>                   
#   1 Animals 15/20/25/26    Cat/Dog/Elephant/Mouse  
# 2 Fruits  1/2/3/4        Banana/Melon/Mango/Apple

Answer 2

stringi 有一个函数可以让你做到这一点：

original$Id <- stri_replace_all_fixed(original$Identification, to_match$Identification, to_match$Id, vectorize_all = F)

当元素被斜杠分隔时匹配两个表的列

Match two tables's columns when the elements are separated by slash

r

match

stringr

dplyr