Hi Young, The test we do currently, to verify correctness, is to take the purported eigenvectors and simply check how far off from eigen-ness they are, as well as verify all of the eigenvectors are orthonormal.
See org.apache.mahout.math.hadoop.decomposer.EigenVerificationJob for how we do cleanup and verification of a eigen extraction. -jake On Wed, Apr 14, 2010 at 10:52 PM, Young Y Kim <yoon...@gmail.com> wrote: > i'm testing my LanczosSolver and i'm having problems validating the result. > if i'm not mistaken, V^T * A * V should equal T (from > http://en.wikipedia.org/wiki/Lanczos_algorithm) but my > LanczosSolver is producing a completely different result. > how do i check if the resulting eigenvalues are correct? > > I've used the basis as V and triDiag as T in solver function. is that > correct? >
