Ismember for rows or something else

Hello! I have to matrices a and b:

a = [1 2;
     3 4;
     5 6;
     7 8;
     1 2;
     9 10]

b = [1 2;
     5 6]

Every row in these tables describe one entity (start and target node of graph edge). So, I want to find indices of a where the rows are equal to rows in b. In other words I need to get this:

c = [1, 3, 5]

But when I use

[~, c] = ismember(b, a, 'row')

I get only this:

c = [1, 3]

Answer 1

[Jan]

Simply swap the inputs:

[found, index] = ismember(a, b, 'rows')
result         = find(found)

[Rostislav Teryaev]

Exactly! Thank you

[Rostislav Teryaev]

I managed to do this:

a = [1 2;3 4;5 6;7 8;1 2;9 10]
b = [1 2;5 6]

a1 = permute(a,[1 3 2])
b1 = permute(b,[3 1 2])

find(any(all(a1==b1 , 3), 2))

:)