Kia ora Aaron As you have identified, test[,2] is not numeric - it is probably factor. Your function must have made the conversion, so you may want to modify that. Alternative, try:
test[order(as.numeric(as.character(test[,2]))),] BTW, str(test) is a good way to find out more about the structure of your object. HTH .... Peter Alspach > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of aaron wells > Sent: Wednesday, 11 March 2009 8:30 a.m. > To: r-help@r-project.org > Subject: [R] ordering > > > Hello, I would like to order a matrix by a specific column. > For instance: > > > > > test > [,1] [,2] [,3] > [1,] 1 100 21 > [2,] 2 3 22 > [3,] 3 100 23 > [4,] 4 60 24 > [5,] 5 55 25 > [6,] 6 45 26 > [7,] 7 75 27 > [8,] 8 12 28 > [9,] 9 10 29 > [10,] 10 22 30 > > > > test[order(test[,2]),] > [,1] [,2] [,3] > [1,] 2 3 22 > [2,] 9 10 29 > [3,] 8 12 28 > [4,] 10 22 30 > [5,] 6 45 26 > [6,] 5 55 25 > [7,] 4 60 24 > [8,] 7 75 27 > [9,] 1 100 21 > [10,] 3 100 23 > > > This works well and good in the above example matrix. > However in the matrix that I actually want to sort (derived > from a function that I wrote) I get something like this: > > > > > test[order(as.numeric(test[,2])),] ### First column is row.names > > > f con f.1 cov f.2 minimum f.3 maximum f.4 cl > asahi * 100 * 1 * 0.1 * 2 * test > castet * 100 * 2 * 0.1 * 5 * test > clado * 100 * 1 * 0.7 * 2 * test > aulac * 33 * 0 * 0.1 * 0.1 * test > buell * 33 * 0 * 0.1 * 0.1 * test > camlas * 33 * 0 * 0.1 * 0.1 * test > carbig * 33 * 1 * 1 * 1 * test > poaarc * 67 * 0 * 0.1 * 0.1 * test > polviv * 67 * 0 * 0.1 * 0.1 * test > > > > > where R interprets 100 to be the lowest value and orders > increasing from there. > > > > > is.numeric(test[,2]) > [1] FALSE > > is.double(test[,2]) > [1] FALSE > > is.integer(test[,2]) > [1] FALSE > > is.real(test[,2]) > [1] FALSE > > > > > My questions are: Why is this happening? and How do I fix it? > > > > Thanks in advance! > > > > Aaron Wells > > _________________________________________________________________ > > > cns!503D1D86EBB2B53C!2285.entry?ocid=TXT_TAGLM_WL_UGC_Contacts_032009 > [[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. > The contents of this e-mail are confidential and may be subject to legal privilege. If you are not the intended recipient you must not use, disseminate, distribute or reproduce all or any part of this e-mail or attachments. If you have received this e-mail in error, please notify the sender and delete all material pertaining to this e-mail. Any opinion or views expressed in this e-mail are those of the individual sender and may not represent those of The New Zealand Institute for Plant and Food Research Limited. ______________________________________________ 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.
