Intersection of two sets keeping all intersected values

Say I have two sets a, and b such that:

a=[1 2 3 4 5 6 6 6 7 8 9 10]
b=[1 12 113  1 25 3 6 6 ]

intersect(a,b)= 1, 3, 6

I want to take the intersection of these two sets, and keep all values of intersection (i.e. not just the unique values that the intersection function outputs).

That is, I want:

intersect(a,b)= 1, 3, 6, 6

[Marc Compere]

this is certainly a valid concern.

there needs to be an option to do this natively. this is not the expected behavior of a set intersection. this is expected behavior of a unique set intersection. unique is ok but there needs to be an option for non-unique similar to 'stable'

Answer 1

[Azzi Abdelmalek]

a=[1 2 3 4 5 6 6 6 7 8 9 10] 
b=[1 12 113 1 25 3 6 6 ]
out=a(ismember(a,b))

[Marc Compere]

this is helpful but should be a default within the set interction function

Answer 2

[Ben11]

Try this:

a(ismember(a,b))

ans =

       1     3     6     6     6

6 appears 3 times since it is at 3 locations in a.