Thanks, John and Jim. In general, the problem is the large number of entries, as you said (I could use up a lot of ink in a large-format plotter, I guess).
Someone has suggested a pivot table in Excel :-) which makes me realize that I need to learn the reshape and plyr packages immediately. The auto example was made up; my real raw data is about a different subject and has far more columns, but I think I can abstract it down. Thanks again. I'll try those ideas out when I get the data in the correct format, and then I'll let you know if I have more questions. Bill -- Bill Harris http://makingsense.facilitatedsystems.com/ Facilitated Systems Everett, WA 98208 USA http://www.facilitatedsystems.com/ phone: +1 425 374-1845 ______________________________________________ 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.
