Computer Manual (MATHEMATICA version) to accompany Pattern Classification, Third Edition, and its associated software contains all the MATHEMATICA code for the dynamic figures in the electronic version of "PATTERN CLASSIFICATION, 3/e, " (Duda, Hart, and Stork) as well as for core algorithms in pattern classification, clustering, and feature extraction described in the text. The code is cross-referenced with the material from the textbook, and uses the same terminology and symbols, so that the conceptual link from course material to working code is tight.