# Math Help - Eigenvalues/vectors

1. ## Eigenvalues/vectors

I know I can check if they are correct using $A\vec{e} = \lambda\vec{e}$

But how can I tell if Eigenvectors are cross row or cross column?

2. I don't exactly know what you mean by "cross row" or "cross column". The eigenvalue problem is defined by the equation you have related. In that equation, $\vec{e}$ is a column vector. If you were to try to formulate an eigenvalue problem using row vectors, it would look like this:

$\vec{e}^{\;T}A^{T}=\lambda\vec{e}^{\:T}.$

Is this what you meant?