intersect

Syntax

intersect(a,b)

intersect(a,b,'sorted')

intersect(a,b,'stable')

intersect(a,b,'rows')

[c,ia,ib] = intersect(a,b)

Inputs

a, b

The sets whose intersection is to be formed.

Type: double | integer | char | string | logical | struct | cell

Dimension: scalar | string | vector | matrix

'sorted' (Default)

Returns elements of the intersection in ascending order.

Type: string

'stable'

Returns elements of the intersection in their original order.

Type: string

'rows'

Returns common rows as opposed to common elements.

Type: string

Outputs

c

The intersection of a and b.

ia, ib

a(ia) and b(ib) are indiex vectors such that a(ia) = c and b(ib) = c.

Examples

Single return case:

intersect([1,5,2;6,2,6],[9;0;1;2])

ans = [Matrix] 2 x 1
1
2

Multi-return case:

[c,ia,ib]=intersect([1,5,2;6,2,6],[9;0;1;2])

c = [Matrix] 2 x 1
1
2
ia = [Matrix] 2 x 1
1
5
ib = [Matrix] 2 x 1
3
4

Multi-return case with rows option:

intersect([1,5,2;6,2,6],[9,0,1;6,2,6],'rows')

ans = [Matrix] 1 x 3
6  2  6

Comments

When repeated elements occur in an input, the last index will be used.