vec-set | R Documentation |
vec_set_intersect()
returns all values in both x
and y
.
vec_set_difference()
returns all values in x
but not y
. Note
that this is an asymmetric set difference, meaning it is not commutative.
vec_set_union()
returns all values in either x
or y
.
vec_set_symmetric_difference()
returns all values in either x
or y
but not both. This is a commutative difference.
Because these are set operations, these functions only return unique values
from x
and y
, returned in the order they first appeared in the original
input. Names of x
and y
are retained on the result, but names are always
taken from x
if the value appears in both inputs.
These functions work similarly to intersect()
, setdiff()
, and union()
,
but don't strip attributes and can be used with data frames.
vec_set_intersect(
x,
y,
...,
ptype = NULL,
x_arg = "x",
y_arg = "y",
error_call = current_env()
)
vec_set_difference(
x,
y,
...,
ptype = NULL,
x_arg = "x",
y_arg = "y",
error_call = current_env()
)
vec_set_union(
x,
y,
...,
ptype = NULL,
x_arg = "x",
y_arg = "y",
error_call = current_env()
)
vec_set_symmetric_difference(
x,
y,
...,
ptype = NULL,
x_arg = "x",
y_arg = "y",
error_call = current_env()
)
x , y |
A pair of vectors. |
... |
These dots are for future extensions and must be empty. |
ptype |
If |
x_arg , y_arg |
Argument names for |
error_call |
The execution environment of a currently
running function, e.g. |
Missing values are treated as equal to other missing values. For doubles and
complexes, NaN
are equal to other NaN
, but not to NA
.
A vector of the common type of x
and y
(or ptype
, if supplied)
containing the result of the corresponding set function.
vec_set_intersect()
vec_proxy_equal()
vec_slice()
vec_ptype2()
vec_cast()
vec_set_difference()
vec_proxy_equal()
vec_slice()
vec_ptype2()
vec_cast()
vec_set_union()
vec_proxy_equal()
vec_slice()
vec_ptype2()
vec_cast()
vec_c()
vec_set_symmetric_difference()
vec_proxy_equal()
vec_slice()
vec_ptype2()
vec_cast()
vec_c()
x <- c(1, 2, 1, 4, 3)
y <- c(2, 5, 5, 1)
# All unique values in both `x` and `y`.
# Duplicates in `x` and `y` are always removed.
vec_set_intersect(x, y)
# All unique values in `x` but not `y`
vec_set_difference(x, y)
# All unique values in either `x` or `y`
vec_set_union(x, y)
# All unique values in either `x` or `y` but not both
vec_set_symmetric_difference(x, y)
# These functions can also be used with data frames
x <- data_frame(
a = c(2, 3, 2, 2),
b = c("j", "k", "j", "l")
)
y <- data_frame(
a = c(1, 2, 2, 2, 3),
b = c("j", "l", "j", "l", "j")
)
vec_set_intersect(x, y)
vec_set_difference(x, y)
vec_set_union(x, y)
vec_set_symmetric_difference(x, y)
# Vector names don't affect set membership, but if you'd like to force
# them to, you can transform the vector into a two column data frame
x <- c(a = 1, b = 2, c = 2, d = 3)
y <- c(c = 2, b = 1, a = 3, d = 3)
vec_set_intersect(x, y)
x <- data_frame(name = names(x), value = unname(x))
y <- data_frame(name = names(y), value = unname(y))
vec_set_intersect(x, y)
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