Aliases: tagged_na na_tag is_tagged_na format_tagged_na print_tagged_na
Keywords:
### ** Examples x <- c(1:5, tagged_na("a"), tagged_na("z"), NA) # Tagged NA's work identically to regular NAs x
[1] 1 2 3 4 5 NA NA NA
is.na(x)
[1] FALSE FALSE FALSE FALSE FALSE TRUE TRUE TRUE
# To see that they're special, you need to use na_tag(), # is_tagged_na(), or print_tagged_na(): is_tagged_na(x)
[1] FALSE FALSE FALSE FALSE FALSE TRUE TRUE FALSE
na_tag(x)
[1] NA NA NA NA NA "a" "z" NA
print_tagged_na(x)
[1] 1 2 3 4 5 NA(a) NA(z) NA
# You can test for specific tagged NAs with the second argument is_tagged_na(x, "a")
[1] FALSE FALSE FALSE FALSE FALSE TRUE FALSE FALSE
# Because the support for tagged's NAs is somewhat tagged on to R, # the left-most NA will tend to be preserved in arithmetic operations. na_tag(tagged_na("a") + tagged_na("z"))
[1] "a"