Hi Andrej, Uwe, Bill isn't the central keyword 'tesseract', on which and it's extensions we have extensive literature?
e.g., starting from http://en.wikipedia.org/wiki/Tesseract I remember an article by Martin Gardner on the construction principles, too. best - Hartmut ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
