If you have checked this then let it pass. I had faced a similar problem, if you are passing the following syntax eigs(A) then it gives largest 6 eigen values by default. To get more of the eigen values use eigs(A,9) *here 9 is an example denoting that you need 9 eigen values arranged in descendin order.
Note: In descending order. All the values are in descending order on contrary to eig command which acc. to my knowledge gives eigen values in ascending order
I have a question, what kind of eigen vector is obtained. I have a input of the form eigs(A,B,5,'sm') implying that I need 5 smallest eigen values. Here as far as I can see the eigen vector generated also has 5 rows so it is incomplete. Incomplete in the sense that I need it(whole of it almost 16 eigen values are present) in my further calculations.