7. The computer storage medium of claim 1 , further comprising the steps of: performing transformations on the first article; and updating the vector array based on the transformations.
7. The computer storage medium of claim 1 , further comprising the steps of: performing transformations on the first article; and updating the vector array based on the transformations. 8. The computer storage medium of claim 7 , wherein the performing transformations step performs at least one transformation selected from the group consisting of an inverse document frequency transform, a term frequency transform, Zipf's law filtering, and band-pass filtering.