matrix - change columns randomly

Hi, how can I change randomly the positions of entire columns in a matrix [nxm]? For example, I want to change my matrix

    A=[ 1 2 3 5 4 ;
        2 2 2 2 2 ;
        4 5 6 7 7 ;
        8 9 8 8 8 ;
        9 9 9 9 9 ];  to change into

    B=[ 3 5 4 2 1;
        2 2 2 2 2;
        6 7 7 5 4;
        8 8 8 9 8;
        9 9 9 9 9]; 
Thank you :)

Answer 1

[Wayne King]

A random shuffling of the columns of A. One way:

cols = size(A,2);
P = randperm(cols);
B = A(:,P);

[Ruchi Agarwal]

how to restore original columns after randperm?