try the following: mdf <- data.frame(us.state, count, year, month) mdf[order(mdf$year, mdf$month), ]
I hope it helps. Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/(0)16/336899 Fax: +32/(0)16/337015 Web: http://med.kuleuven.be/biostat/ http://www.student.kuleuven.be/~m0390867/dimitris.htm Quoting John Kane <[EMAIL PROTECTED]>: > I have a dataframe where I would like to order first > by variable, year, and then within that variable by > month. > > So far the only way that I have seen to do this is to > order by year and then subset year and sort by month > and then do an rbind to get things back together. > > Is this the right approach? > > Example: > > us.state <-rep("California", 23) > > count <- c(774,283,774,283,508,283,774,283,602,283, > > 774,508,0,602,330,283,283,283,602,301,126, NA,301) > > year <- c(2002, 2003, 2001, 2002, 2001, 2002, 2001, > 2002, 2002, 2003, > 2002, 2002, 2001, 2002, 2001, 2002, 2001, > 2002, 2001, 2002, > 2001, 2001, 2002) > > month <- c( 1, 1, 10, 10, 11, 11, 12, 12, > > 2, 2, 3, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, > 9) > > > > > df <- data.frame (cbind(us.state,count, year, month)) > > # ordering as a factor works here > > df1 <- df[order(df$year),] > > df1 > > > > df2 <- subset(df1, year==2001) > > > > # ordering as a factor works but not a good > appearance. > > > df3 <- df2[order(as.numeric(df2$month)),] > > df3 > > > > This works but "month" is ordered as a factor and I > would prefer to coerce it into a numeric for > presentation purposes but > df3 <- df2[order(as.numeric(df2$month)),] does not > seem to work, nor has a couple of other things I've > tried. > > Any suggestions gratefully received. > > ______________________________________________ > R-help@stat.math.ethz.ch 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. > > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm ______________________________________________ R-help@stat.math.ethz.ch 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.