intersect
intersect(s1,s2...) âˆ©(s1,s2)
Construct the intersection of two or more sets. Maintains order and multiplicity of the first argument for arrays and ranges.
Examples
julia> set1 = Set(3, 4, 5, 6)
set2 = Set(1, 3, 4)
intersect(set1, set2)
Set{Int64}({4,3})
julia> set1 = Set(3, 4, 5, 6)
set2 = Set(1, 2)
intersect(set1, set2)
Set{Int64}({})
julia> a = Set([0:3:30]); # table of 3
julia> b = Set([0:5:50]); # table of 5
julia> intersect(a, b)
Set{Int64}({0,15,30})

Find the intersection of two arrays:
julia> arr1 = [1, 2, 3, 4, 5]; julia> arr2 = [4, 5, 6, 7, 8]; julia> intersect(arr1, arr2) 2element Array{Int64,1}: 4 5
This example finds the common elements between
arr1
andarr2
using theintersect
function. 
Find the intersection of multiple arrays:
julia> arr1 = [1, 2, 3, 4, 5]; julia> arr2 = [4, 5, 6, 7, 8]; julia> arr3 = [3, 4, 5, 9, 10]; julia> intersect(arr1, arr2, arr3) 2element Array{Int64,1}: 4 5
In this example, the
intersect
function is used to find the common elements amongarr1
,arr2
, andarr3
.  Intersect two sets with different element types:
julia> set1 = Set([1, 2, 3, 4]); julia> set2 = Set([3.0, 4.0, 5.0]); julia> intersect(set1, set2) Set{Float64} with 2 elements: 3.0 4.0
The
intersect
function can also be used to find the common elements between sets of different element types.
Common mistake example:
julia> intersect([1, 2, 3], (3, 4, 5))
ERROR: MethodError: no method matching intersect(::Array{Int64,1}, ::Tuple{Int64,Int64,Int64})
In this example, the intersect
function is used with an array and a tuple. However, the intersect
function does not support intersection between arrays and tuples. Make sure to provide valid arguments to the intersect
function that are compatible with each other.
See Also
complement, complement!, intersect, intersect!, issubset, selectperm, selectperm!, Set, setdiff, setdiff!, symdiff, union, union!,User Contributed Notes
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