Returns (at least) factors of !NA and NA, where !NA indicates a datum that is not missing, and NA indicates missingness. It also allows you to specify some new missings, if you like. This function is what powers the factor levels in as_shadow().

shade(x, ..., extra_levels = NULL)

Arguments

x

a vector

...

additional levels of missing to add

extra_levels

extra levels you might to specify for the factor.

Examples

df <- tibble::tribble( ~wind, ~temp, -99, 45, 68, NA, 72, 25 ) shade(df$wind)
#> [1] !NA !NA !NA #> Levels: !NA NA
shade(df$wind, inst_fail = -99)
#> [1] NA_inst_fail !NA !NA #> Levels: !NA NA NA_inst_fail