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

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 19.05.2008 13:06:33:

> 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)), ]

Quite close

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

Regards
Petr


> 
> 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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