R forcats fct_recode 手動更改因子水平

fct_recode(.f, ...)

x <- factor(c("apple", "bear", "banana", "dear"))
fct_recode(x, fruit = "apple", fruit = "banana")
#> [1] fruit bear  fruit dear 
#> Levels: fruit bear dear

# If you make a mistake you'll get a warning
fct_recode(x, fruit = "apple", fruit = "bananana")
#> Warning: Unknown levels in `f`: bananana
#> [1] fruit  bear   banana dear  
#> Levels: fruit banana bear dear

# If you name the level NULL it will be removed
fct_recode(x, NULL = "apple", fruit = "banana")
#> [1] <NA>  bear  fruit dear 
#> Levels: fruit bear dear

# Wrap the left hand side in quotes if it contains special variables
fct_recode(x, "an apple" = "apple", "a bear" = "bear")
#> [1] an apple a bear   banana   dear    
#> Levels: an apple banana a bear dear

# When passing a named vector to rename levels use !!! to splice
x <- factor(c("apple", "bear", "banana", "dear"))
levels <- c(fruit = "apple", fruit = "banana")
fct_recode(x, !!!levels)
#> [1] fruit bear  fruit dear 
#> Levels: fruit bear dear