You can use the reshape() in core R (the stats package) > reshape(a, timevar="year", idvar="name", direction="wide") name amount.1971 amount.1972 amount.1973 amount.1974 1 a 1 2 3 4 11 b 11 12 13 14 amount.1975 amount.1976 amount.1977 amount.1978 1 5 6 7 8 11 15 16 17 18 amount.1979 amount.1980 amount.1981 amount.1982 1 9 10 NA NA 11 19 20 21 22 amount.1983 amount.1984 amount.1985 1 NA NA NA 11 23 24 25
(Was naming the output columns "X.<year>" instead of "amount.<year>" important?) Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On > Behalf Of Trevor Davies > Sent: Friday, November 18, 2011 4:05 PM > To: r-help@r-project.org > Subject: [R] reshape data.frame > > A late friday afternoon coding question. I'm having a hard time thinking > of the correct search terms for what I want to do. > > If I have a df like this: > > a <- > data.frame(name=c(rep('a',10),rep('b',15)),year=c(1971:1980,1971:1985),amount=1:25) > name year amount > 1 a 1971 1 > 2 a 1972 2 > 3 a 1973 3 > 4 a 1974 4 > 5 a 1975 5 > 6 a 1976 6 > 7 a 1977 7 > 8 a 1978 8 > 9 a 1979 9 > 10 a 1980 10 > 11 b 1971 11 > 12 b 1972 12 > 13 b 1973 13 > 14 b 1974 14 > 15 b 1975 15 > 16 b 1976 16 > 17 b 1977 17 > 18 b 1978 18 > 19 b 1979 19 > 20 b 1980 20 > 21 b 1981 21 > 22 b 1982 22 > 23 b 1983 23 > 24 b 1984 24 > 25 b 1985 25 > > > and I'd like to reshape it so it is like this: > X.1971 X.1972 X.1973 X.1974 X.1975 X.1976 X.1977 X.1978 X.1979 X.1980 > X.1981 > a 1 2 3 4 5 6 7 8 9 10 > NA > b 11 12 13 14 15 16 17 18 19 20 > 21 > X.1982 X.1983 X.1984 X.1985 > a NA NA NA NA > b 22 23 24 25 > > Thanks for the assist. > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. ______________________________________________ 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.
