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[英]Need to update a DataFrame in R from another DataFrame, colnames of one dataframe matches contents of other dataframe
[英]Finding all string matches from another dataframe in R
我在 R 中相對較新。
我有一個數據框locs
,它有 1 個變量V1
,看起來像:
V1
edmonton general hospital
cardiovascular institute, hospital san carlos, madrid spain
hospital of santa maria, lisbon, portugal
另一個數據框cities
有兩個如下所示的變量:
city country
edmonton canada
san carlos spain
los angeles united states
santa maria united states
tokyo japan
madrid spain
santa maria portugal
lisbon portugal
我想在locs
中創建兩個新變量,這些變量將city
內V1
任何字符串匹配相關聯,以便locs
如下所示:
V1 city country
edmonton general hospital edmonton canada
hospital san carlos, madrid spain san carlos, madrid spain
hospital of santa maria, lisbon, portugal santa maria, lisbon portugal, united states
需要注意的幾點: V1
可能有多個國家/地區名稱。 另外,如果有一個重復的國家(例如,聖卡洛斯和馬德里都在西班牙),那么我只想要該國家的一個實例。
請指教。
謝謝。
使用tidyverse
和stringr
解決方案。 locs2
是最終輸出。
library(tidyverse)
library(stringr)
locs2 <- locs %>%
rowwise() %>%
mutate(city = list(str_match(V1, cities$city))) %>%
unnest() %>%
drop_na(city) %>%
left_join(cities, by = "city") %>%
group_by(V1) %>%
summarise_all(funs(toString(sort(unique(.)))))
結果
locs2 %>% as.data.frame()
V1 city country
1 cardiovascular institute, hospital san carlos, madrid spain madrid, san carlos spain
2 edmonton general hospital edmonton canada
3 hospital of santa maria, lisbon, portugal lisbon, santa maria portugal, united states
數據
library(tidyverse)
locs <- data_frame(V1 = c("edmonton general hospital",
"cardiovascular institute, hospital san carlos, madrid spain",
"hospital of santa maria, lisbon, portugal"))
cities <- read.table(text = "city country
edmonton canada
'san carlos' spain
'los angeles' 'united states'
'santa maria' 'united states'
tokyo japan
madrid spain
'santa maria' portugal
lisbon portugal",
header = TRUE, stringsAsFactors = FALSE)
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