MATLAB: How to scramble positions of a matrix

Question

Hello, I've been trying to scramble the positions of a matrix. I have generated two sequences which help us to scramble the positions of the matrix. Eg;

 X=[1 3 2 4]
 Y=[3 4 1 2]
ie (X,Y) is used to scramble the positions of  a 4x4 matrix
 Let A= 56 77 228 99
        88 31 52  21
        32 74 90  28
        66 99 42  33
now using the above two vectors i have the following order 
    B= (1,3) (1,4) (1,1) (1,2)
       (3,3) (3,4) (3,1) (3,2)
       (2,3) (2,4) (2,1) (2,2)
       (4,3) (4,4) (4,1) (4,2)
ie
    B= 228 99 56 77
       90  28 32 74
       52  21 88 31
       42  33 66 99.

in addition i would also like to know how i can reverse the positions again ie th first element should be placed at (1,3). please help thanks in advance

Answer 1

Just use the inverses of X and Y:

   X2 = zeros(1,4); X2(X) = 1:4;
   Y2 = zeros(1,4); Y2(Y) = 1:4;
   A2 = B(X2,Y2);