【848】Data filtering in R programming

ref: R语言data.frame常用操作

ref: Keep rows that match a condition

The filter() function is used to subset a data frame, retaining all rows that satisfy your conditions. To be retained, the row must produce a value of TRUE for all conditions. Note that when a condition evaluates to NA the row will be dropped, unlike base subsetting with [.

Examples

# Filtering by one criterion
filter(starwars, species == "Human")
 
filter(starwars, mass > 1000)
 
# Filtering by multiple criteria within a single logical expression
filter(starwars, hair_color == "none" & eye_color == "black")
 
filter(starwars, hair_color == "none" | eye_color == "black")
 
# When multiple expressions are used, they are combined using &
filter(starwars, hair_color == "none", eye_color == "black")