Hi. Here is an example of sorting matrix columns:
> mat <- matrix(10:1, ncol=2, byrow=TRUE)
> mat
[,1] [,2]
[1,] 10 9
[2,] 8 7
[3,] 6 5
[4,] 4 3
[5,] 2 1
> apply(mat, 2, function(x) x[order(x)])
[,1] [,2]
[1,] 2 1
[2,] 4 3
[3,] 6 5
[4,] 8 7
[5,] 10 9
You should read help page [, apply and order (?"[", ?apply, ?order)
Hope this helps
Andrija
On Sat, Jun 15, 2013 at 12:36 PM, Ola Cabaj <olaca...@gmail.com> wrote:
> I would like to sort matrix3, so that every column in output matrix is
> sorted. Also I have to "unsort" it later on.
>
> matrix1<-matrix(rnorm(100,354,78),ncol=10)
> matrix2<-matrix(rnorm(100,225,102),ncol=10)
> matrix3<-cbind(matrix1,matrix2)
> nrCol<-length(matrix3[1,])
> class1<-1:10
> for(i in 1:nrCol)
> {
> sorted.matrix<-matrix3[order(matrix3[class1,i]),]
> }
> for(i in 1:liczbaKolumn)
> {
> output<-sorted.matrix[order(matrix3[class1,i]),]
> }
>
> --
> Aleksandra Cabaj
>
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>
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