> General Question: I assume the answer to the specific question is dependent > on my understanding list objects and accessing their attributes. Can anyone > point me to a good, throrough treatment of these R topics? Specifically how > to read and interpret the output of the str(), and attributes() function, > how to extract the values of the 'by' output object into a data frame, etc.?
It's not quite what you're asking for, but you might want to have a look at the plyr package, http://had.co.nz/plyr, as an alternative. Plyr provides a consistent set of methods for manipulating data frames and lists to solve the same general problem that you struggled with in your email - breaking up a complex structure, operating on each piece, and then joining all the results back together. Hadley -- http://had.co.nz/ ______________________________________________ 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.
