MATLAB: Ismember for rows or something else

ismemberMATLAB

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]

Best Answer

Simply swap the inputs:
[found, index] = ismember(a, b, 'rows')
result         = find(found)
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