R help - Apr 2010 - Permutation of Matrix

Hi all,

How can I have a permuted matrix where the second row is the permutation
over the first row ; third is the permutation of the second row; forth is
the permutation of the third row and so on ?

Thanks.

-- 
Regards,
Ayush Raman

	[[alternative HTML version deleted]]

On Apr 5, 2010, at 4:58 PM, Ayush Raman wrote:
> Hi all,
>
> How can I have a permuted matrix where the second row is the  
> permutation
> over the first row ; third is the permutation of the second row;  
> forth is
> the permutation of the third row and so on ?
Wouldn't any of those permutations just be a permutation of the first  
row? Perhaps something like:


M <- matrix(first_row, length(first_row), length(first_row))
M[1, ] <- first_row
M[2:length(first_row), ] <- rbind(
           t(sapply(2:length(first_row), function(x) {
                        sample(first_row, length(first_row),  
replace=FALSE) }
             )     )
                                  )



-- 

David Winsemius, MD
West Hartford, CT