From: john seers (IFR) <john.seers_at_bbsrc.ac.uk>

Date: Mon, 19 May 2008 12:24:22 +0100

Date: Mon, 19 May 2008 12:24:22 +0100

Try:

mat <- mat[order(rownames(mat)), ]

--- -----Original Message----- From: r-help-bounces_at_r-project.org [mailto:r-help-bounces_at_r-project.org] On Behalf Of Paul Geeleher Sent: 19 May 2008 12:07 To: r-help_at_r-project.org Subject: [R] Sort matrix with duplicate row names alphabetically by rowname Hi, I've a matrix that contains 4 replicates of each rowname. (4 a's, 4 b's, 4 c's in no particular order) Like this: # c 32 a 1 b 4 c 87 c 34 b 54 a 23 a 12 b 9 a 3 b 87 c 43 There are a couple of more columns but I'm using the above as an example I need to sort it so that the same rownames appear together in alpahbetical order. Like this:Received on Mon 19 May 2008 - 11:28:24 GMT

#

a 1 a 23 a 12 a 3 b 4 b 54 b 9 b 87 c 87 c 34 c 43 c 32 The code I came up with is something like this: mat <- mat[sort(rownames(mat)), ] This doesn't work though, it returns the same value for each row each time, something like this:

#

a 1 a 1 a 1 a 1 b 4 b 4 b 4 b 4 c 32 c 32 c 32 c 32 Any ideas how I could get my code to distinguish between the different rows and get the output I'm looking for? Thanks, -Paul ______________________________________________ R-help_at_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_at_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.

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