Parse factors
parse_factor is similar to factor(), but will generate
warnings if elements of x are not found in levels.
parse_factor(
x,
levels = NULL,
ordered = FALSE,
na = c("", "NA"),
locale = default_locale(),
include_na = TRUE,
trim_ws = TRUE
)
col_factor(levels = NULL, 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 interpret as 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 |
trim_ws |
Should leading and trailing whitespace be trimmed from each field before parsing it? |
Other parsers:
col_skip(),
cols_condense(),
cols(),
parse_datetime(),
parse_guess(),
parse_logical(),
parse_number(),
parse_vector()
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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.