G?ran Brostr?m <gb at stat.umu.se> responded to my call for help (Please Help. Subtraction of Matrices?), and has now supplied enough information that I should be able to solve my problem. My very great thanks to all who read and responded. --- Gene Barlow, Ft. Lauderdale, FL -------------- next part -------------- An HTML attachment was scrubbed... URL: https://stat.ethz.ch/pipermail/r-help/attachments/20021031/6ca25fe2/attachment.html