[R] sort (all columns of) a matrix

[Henrique Dallazuanna]

Try this:

a[order(a[,1], a[,2]),]

On Thu, Oct 8, 2009 at 1:50 PM, Kajan Saied <kajan.saied at gmail.com> wrote:
> Dear R-Help Team,
>
> I have been trying to sort (all columns of) a matrix:
>
>> a<-matrix(a<-c(1,3,4,6,6,4,6,56,4,64,86,39,4,2),length(a),2)
>> a
>      [,1] [,2]
>  [1,]    1    1
>  [2,]    3    3
>  [3,]    4    4
>  [4,]    6    6
>  [5,]    6    6
>  [6,]    4    4
>  [7,]    6    6
>  [8,]   56   56
>  [9,]    4    4
> [10,]   64   64
> [11,]   86   86
> [12,]   39   39
> [13,]    4    4
> [14,]    2    2
>>
> I would like to have the matrix sorted and the output should again be *a
> matrix* with nrow=length(a) and ncol=2 just like (a) but only
> sorted. Whatever I try (be it sort(), order()...) I receive a vector of
> length(a)*2...
>
> Could you please help me?
>
> Best regards,
>
> kajan
>
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>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O