I successfully combined my data frames, and am now on my next hurdle. I had combined the data and quarter, and used tapply to count the entries for each unique date/quarter pair. ar= tapply(ewrgnd$gw, list(ewrgnd$dq), sum) #for each date/quarter combination sums the gw (which are all 1) dq=row.names(ar) spl=strsplit(dq) But I need to split them back into the separate date and quarter. So I used strsplit(), and get > spl [[1]] [1] "2009-01-01" "60"
[[2]] [1] "2009-01-01" "61" [[3]] [1] "2009-01-01" "62" [[4]] [1] "2009-01-01" "63" [[5]] [1] "2009-01-01" "68" . . . But lists throw me. I want to get separate vectors of the date and quarter out of my list. All the things I have seen extract rows from the list. I need to extract columns. Thanks list, Jim Rome ______________________________________________ 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.