[英]Mutate across columns and replace entries with case_when
當列和單元格符合條件時,我正在嘗試更改單元格條目。
數據:
df <- data.frame(a=c("a", "ab", "ac"), b=c("b", "bc", NA), c=c("c", NA, "cda"))
> df
a b c
1 a b c
2 ab bc <NA>
3 ac <NA> cda
試圖:
> df %>% mutate(across(matches("b", "c"), ~case_when(. %in% "c" & is.na(.) ~ "here", TRUE ~ as.character(.))))
a b c
1 a b c
2 ab bc <NA>
3 ac <NA> cda
尋找這個:
a b c
1 a b c
2 ab bc here
3 ac here cda
嘗試這個:
library(tidyverse)
data.frame(a=c("a", "ab", "ac"), b=c("b", "bc", NA), c=c("c", NA, "cda")) |>
mutate(across(everything(), ~if_else(is.na(.), "here", .)))
#> a b c
#> 1 a b c
#> 2 ab bc here
#> 3 ac here cda
由reprex 包於 2022-05-11 創建 (v2.0.1)
只需across
cross 中聲明變量,即
df %>%
mutate(across(c('b', 'c'), ~replace(., is.na(.), 'here')))
a b c
1 a b c
2 ab bc here
3 ac here cda
在base
R 中:
df[, c("b", "c")][is.na(df[, c("b", "c")])] <- "here"
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