Seems like GE on a 2x2 matrix should be pretty darn fast.... especially if you use scalar * vector type operations.

Abstract Let A be an n × n Hermitian matrix and A = UΛUH be its spectral decomposition, where U is a unitary matrix of order n and Λ is a diagonal matrix. In this note we present the perturbation ...

Workspace Your Artstor image groups were copied to Workspace. The Artstor website will be retired on Aug 1st. SIAM Journal on Numerical Analysis Vol. 7, No. 3, Sep., 1970 On the Maximal Eigenvector of ...