These functions work like rlang::names2(), names() and names<-(),
except that they return or modify the the rowwise names of the vector. These are:
The usual names() for atomic vectors and lists
The row names for data frames and matrices
The names of the first dimension for arrays
Rowwise names are size consistent: the length of the names always equals
vec_size().
vec_names2() returns the repaired names from a vector, even if it is unnamed.
See vec_as_names() for details on name repair.
vec_names() is a bare-bones version that returns NULL if the vector is
unnamed.
vec_set_names() sets the names or removes them.
vec_names2(
x,
...,
repair = c("minimal", "unique", "universal", "check_unique", "unique_quiet",
"universal_quiet"),
quiet = FALSE
)
vec_names(x)
vec_set_names(x, names)A vector with names
These dots are for future extensions and must be empty.
Either a string or a function. If a string, it must be one of
"check_unique", "minimal", "unique", "universal", "unique_quiet",
or "universal_quiet". If a function, it is invoked with a vector of
minimal names and must return minimal names, otherwise an error is thrown.
Minimal names are never NULL or NA. When an element doesn't
have a name, its minimal name is an empty string.
Unique names are unique. A suffix is appended to duplicate names to make them unique.
Universal names are unique and syntactic, meaning that you can safely use the names as variables without causing a syntax error.
The "check_unique" option doesn't perform any name repair.
Instead, an error is raised if the names don't suit the
"unique" criteria.
The options "unique_quiet" and "universal_quiet" are here to help the
user who calls this function indirectly, via another function which exposes
repair but not quiet. Specifying repair = "unique_quiet" is like
specifying repair = "unique", quiet = TRUE. When the "*_quiet" options
are used, any setting of quiet is silently overridden.
By default, the user is informed of any renaming
caused by repairing the names. This only concerns unique and
universal repairing. Set quiet to TRUE to silence the
messages.
Users can silence the name repair messages by setting the
"rlib_name_repair_verbosity" global option to "quiet".
A character vector, or NULL.
vec_names2() returns the names of x, repaired.
vec_names() returns the names of x or NULL if unnamed.
vec_set_names() returns x with names updated.
vec_names2(1:3)
#> [1] "" "" ""
vec_names2(1:3, repair = "unique")
#> New names:
#> • `` -> `...1`
#> • `` -> `...2`
#> • `` -> `...3`
#> [1] "...1" "...2" "...3"
vec_names2(c(a = 1, b = 2))
#> [1] "a" "b"
# `vec_names()` consistently returns the rowwise names of data frames and arrays:
vec_names(data.frame(a = 1, b = 2))
#> NULL
names(data.frame(a = 1, b = 2))
#> [1] "a" "b"
vec_names(mtcars)
#> [1] "Mazda RX4" "Mazda RX4 Wag" "Datsun 710"
#> [4] "Hornet 4 Drive" "Hornet Sportabout" "Valiant"
#> [7] "Duster 360" "Merc 240D" "Merc 230"
#> [10] "Merc 280" "Merc 280C" "Merc 450SE"
#> [13] "Merc 450SL" "Merc 450SLC" "Cadillac Fleetwood"
#> [16] "Lincoln Continental" "Chrysler Imperial" "Fiat 128"
#> [19] "Honda Civic" "Toyota Corolla" "Toyota Corona"
#> [22] "Dodge Challenger" "AMC Javelin" "Camaro Z28"
#> [25] "Pontiac Firebird" "Fiat X1-9" "Porsche 914-2"
#> [28] "Lotus Europa" "Ford Pantera L" "Ferrari Dino"
#> [31] "Maserati Bora" "Volvo 142E"
names(mtcars)
#> [1] "mpg" "cyl" "disp" "hp" "drat" "wt" "qsec" "vs" "am" "gear"
#> [11] "carb"
vec_names(Titanic)
#> [1] "1st" "2nd" "3rd" "Crew"
names(Titanic)
#> NULL
vec_set_names(1:3, letters[1:3])
#> a b c
#> 1 2 3
vec_set_names(data.frame(a = 1:3), letters[1:3])
#> a
#> a 1
#> b 2
#> c 3