Thank you all for your responses, the lapply works perfectly. The example I gave IS odd. I only realized after I posted that tt had 5 rows and should have only had 3, so I apologize for that (I initially had X to have 5 list elements).
Bert, I tend to use for loops in excess and often unnecessarily, so I am trying to learn to code without the mental crutch that for loops solve all problems. Thanks again, Tina ______________________________________________ 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.