# How to permute the rows and columns in a matrix ?

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Nguyen Trong Nhan on 30 Dec 2013
Answered: Daniel Morais on 21 Mar 2017
for example: I have matrix A: A = [1 2 3 4;5 6 7 8;9 10 11 12;13 14 15 16] how to permute between column 1 and column 4 ? how to permute between row 1 and row 3 ? thanks

Wayne King on 30 Dec 2013
Edited: Wayne King on 30 Dec 2013
Swapping the columns
idx = [4 2 3 1];
B = A(:,idx);
Swapping the rows
idx = [3 2 1 4];
C = A(idx,:);

Sean de Wolski on 30 Dec 2013
So
A([4,1],:) = A([1,4],:)
?
Nguyen Trong Nhan on 30 Dec 2013
cannot permute between columns ?

Daniel Morais on 21 Mar 2017
Utilize x = x( : , randperm(c)), onde x é a matriz e c o número de colunas de x. O mesmo vale para a permutação de linhas: x = x( randperm(l) , : ) onde l é o número de linhas.

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