parse_factor {readr} | R Documentation |
parse_factor
is similar to factor()
, but will generate
warnings if elements of x
are not found in levels
.
parse_factor(x, levels, ordered = FALSE, na = c("", "NA"), locale = default_locale(), include_na = TRUE) col_factor(levels, ordered = FALSE, include_na = FALSE)
x |
Character vector of values to parse. |
levels |
Character vector providing set of allowed levels. if |
ordered |
Is it an ordered factor? |
na |
Character vector of strings to use for missing values. Set this
option to |
locale |
The locale controls defaults that vary from place to place.
The default locale is US-centric (like R), but you can use
|
include_na |
If |
Other parsers: col_skip
,
parse_datetime
, parse_guess
,
parse_logical
, parse_number
parse_factor(c("a", "b"), letters) x <- c("cat", "dog", "caw") levels <- c("cat", "dog", "cow") # Base R factor() silently converts unknown levels to NA x1 <- factor(x, levels) # parse_factor generates a warning & problems x2 <- parse_factor(x, levels) # Using an argument of `NULL` will generate levels based on values of `x` x2 <- parse_factor(x, levels = NULL)