Hi, Bill, Thank you for your reply. The -as.numeric() does not work as I expected. BA[2] is character with elements like 2A, 2B, 2C, 3, 4A, 4B, 5. I want it to be sorted as 5, 4B, 4A, 3, 2C, 2B, 2A. The -as.numeric() method produces 5, 3, 2A, 2B, 2C, 4A, 4B.
xtrfm() suggested by Duncan works very well. Jun On Fri, Mar 27, 2009 at 8:50 PM, <bill.venab...@csiro.au> wrote: > Perhaps BA[, 2] is a factor? What you might need is something like > > BA[order(BA[, 1], -as.numeric(BA[, 2]), ] > > ? > > Bill Venables. > ________________________________________ > From: r-help-boun...@r-project.org [r-help-boun...@r-project.org] On > Behalf Of Jun Shen [jun.shen...@gmail.com] > Sent: 28 March 2009 08:26 > To: r-h...@stat.math.ethz.ch > Subject: [R] Sorting problem > > Hi, everyone, > > I was trying to sort a data frame by two columns, one increasing, the other > decreasing and got an error. > > "Error in FUN(left) : invalid argument to unary operator", > > The command is "BA[order(BA[1],-BA[2]),]". BA is the data frame. It was > working if I used increasing on both columns. > > Why the decreasing symbol "-" is not working here? Thanks. > > -- > Jun Shen PhD > PK/PD Scientist > BioPharma Services > Millipore Corporation > 15 Research Park Dr. > St Charles, MO 63304 > Direct: 636-720-1589 > > [[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. > -- Jun Shen PhD PK/PD Scientist BioPharma Services Millipore Corporation 15 Research Park Dr. St Charles, MO 63304 Direct: 636-720-1589 [[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.
