Wrong output from eigs function

I've been having problmens when using the eigs command. So i tried just tiping [A,V]=eigs(eye(10)) where i expected two identity matrices as output. Except that it returns two 10x6 matrices whose non zero input are not even one. What am i doing wrong?

Answer 1

[Ameer Hamza]

According to the documentation of eigs(), by default, it returns 6 largest eigenvalues and their corresponding eigenvectors. Matrix V contains the eigen values along the diagonal, whereas matrix A contains six eigen vectors, one in each column.

[Matteo Aluffi]

I solved thanks. Didn't know that there were both eig and eigs commands. Using eig it works fine

[KALYAN ACHARJYA]

@Ameer Thanks, at first glance, I didn't see it.

d = eigs(A) %returns a vector of the six largest magnitude eigenvalues of matrix A

More:

d = eigs(A,k) returns the k largest magnitude eigenvalues.

[Ameer Hamza]

Yes, that correct. In Matteo's case, following two will be same

[A,V]=eig(eye(10))
% or
[A,V]=eigs(eye(10),10)