Convert values to NA
This is a translation of the SQL command NULLIF. It is useful
if you want to convert an annoying value to NA.
na_if(x, y)
x |
Vector to modify |
y |
Value to replace with NA |
A modified version of x that replaces any values that
are equal to y with NA.
coalesce() to replace missing values with a specified
value.
tidyr::replace_na() to replace NA with a value.
recode() to more generally replace values.
na_if(1:5, 5:1)
x <- c(1, -1, 0, 10)
100 / x
100 / na_if(x, 0)
y <- c("abc", "def", "", "ghi")
na_if(y, "")
# na_if() is particularly useful inside mutate(),
# and is meant for use with vectors rather than entire data frames
starwars %>%
select(name, eye_color) %>%
mutate(eye_color = na_if(eye_color, "unknown"))
# na_if() can also be used with mutate() and across()
# to mutate multiple columns
starwars %>%
mutate(across(where(is.character), ~na_if(., "unknown")))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.