Trouble sorting the matrix

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Hello,

If I understand it correctly, the following should sort all columns of 
matrix3 and then unsort the sorted matrix.


ord <- apply(matrix3, 2, order)

# sort matrix3
mat4 <- sapply(seq_len(ncol(ord)), function(i) matrix3[ord[,i], i])
mat4

# unsort mat4
mat5 <- sapply(seq_len(ncol(ord)), function(i) mat4[order(ord[,i]), i])

identical(matrix3, mat5)  # TRUE


Hope this helps,

Rui Barradas

Em 15-06-2013 11:36, Ola Cabaj escreveu:

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]),]
   }