Perform set operations on Vector objects.
1 2 3 4 5 6 7 8 9 10 11 
x, y 
Vectorlike objects. 
The union
, intersect
, and setdiff
methods for
Vector objects return a Vector object containing respectively
the union, intersection, and (asymmetric!) difference of the 2 sets of
vector elements in x
and y
.
The setequal
method for Vector objects checks for set
equality between x
and y
.
They're defined as follow:
1 2 3 4 5 6 7 8 9 10 11 12 13  setMethod("union", c("Vector", "Vector"),
function(x, y) unique(c(x, y))
)
setMethod("intersect", c("Vector", "Vector"),
function(x, y) unique(x[x %in% y])
)
setMethod("setdiff", c("Vector", "Vector"),
function(x, y) unique(x[!(x %in% y)])
)
setMethod("setequal", c("Vector", "Vector"),
function(x, y) all(x %in% y) && all(y %in% x)
)

so they work outofthebox on Vector objects for which c
,
unique
, and %in%
are defined.
union
returns a Vector object obtained by appending to x
the elements in y
that are not already in x
.
intersect
returns a Vector object obtained by keeping only
the elements in x
that are also in y
.
setdiff
returns a Vector object obtained by dropping from
x
the elements that are in y
.
setequal
returns TRUE
if x
and y
contain the
same sets of vector elements and FALSE
otherwise.
union
, intersect
, and setdiff
propagate the names and
metadata columns of their first argument (x
).
Hervé Pagès
Vectorcomparison for comparing and ordering vectorlike objects.
Vectormerge for merging vectorlike objects.
Vector objects.
BiocGenerics::union
,
BiocGenerics::intersect
,
and BiocGenerics::setdiff
in the BiocGenerics package for general information about
these generic functions.
1  ## See ?`Hitssetops` for some examples.

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