Set operations on Hits objects
Description
Perform set operations on Hits objects.
Details
union(x, y)
, intersect(x, y)
, setdiff(x, y)
, and
setequal(x, y)
work on Hits objects x
and y
only if the objects are compatible Hits objects, that is, if they
have the same subject and query lengths. These operations return respectively
the union, intersection, (asymmetric!) difference, and equality of the
sets of hits in x
and y
.
Value
union
returns a Hits object obtained by appending to x
the hits in y
that are not already in x
.
intersect
returns a Hits object obtained by keeping only
the hits in x
that are also in y
.
setdiff
returns a Hits object obtained by dropping from
x
the hits that are in y
.
setequal
returns TRUE
if x
and y
contain the
same sets of hits and FALSE
otherwise.
union
, intersect
, and setdiff
propagate the names and
metadata columns of their first argument (x
).
Author(s)
Hervé Pagès and Michael Lawrence
See Also

Hits objects.

Hitscomparison for comparing and ordering hits.

BiocGenerics::union
,BiocGenerics::intersect
, andBiocGenerics::setdiff
in the BiocGenerics package for general information about these generic functions.
Examples
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19  x < Hits(c(2, 4, 4, 4, 5, 5), c(3, 1, 3, 2, 3, 2), 6, 3,
score=11:16)
x
y < Hits(c(1, 3, 4, 4, 5, 5, 5), c(3, 3, 2, 1, 2, 1, 3), 6, 3,
score=21:27)
y
union(x, y)
union(y, x) # same hits as in union(x, y), but in different order
intersect(x, y)
intersect(y, x) # same hits as in intersect(x, y), but in
# different order
setdiff(x, y)
setdiff(y, x)
setequal(x, y)

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