[R] Sort matrix with duplicate row names alphabetically by rowname

[Paul Geeleher]

Ah, job done, that was simple!

Thanks,

-Paul.

On Mon, May 19, 2008 at 12:24 PM, john seers (IFR)
<john.seers at bbsrc.ac.uk> wrote:
>
>
> 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:
>
>  #
> 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
>
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