How to generate random matrix from another one?

Hi!

I have a 18 x 57x11 matrix .

How can I make a new random matrix (the same size) , which is generated by "shuffling" the values of the original matrix?

A lot thanks in advance!

[Adam Danz]

Ha! You got 3 different approaches that use randperm() and reshape().

By the way, your data is not a matrix. A matrix is 2 dimensional, with rows and columns. Your data contains a 3rd dimension which makes it an array. All 3 answers will work no matter how many dimensions are in the input.

Answer 1

[Adam Danz]

You can use randperm() to shuffle the values of array 'm'.

% Original array
m =rand(180, 57, 11);

% Random permutation index
randpermIdx = randperm(numel(m)); 

% m shuffled
mShuffle = reshape(m(randpermIdx), size(m)); 

To convince yourself that mShuffle is merely a random reorganization of m with no additional or missing values or duplicate samples, use this line below which should return True.

isequaln(sort(m(:)),sort(mShuffle(:)))

[IM]

Thanks Adam ;)!!!

Answer 2

[Bruno Luong]

A is your input matrix

Ashuffle = reshape(A(randperm(numel(A))),size(A))

[IM]

Thanks Bruno ;) !!!

Answer 3

[Adam]

newMatrix = reshape( oldMatrix( randperm( numel( oldMatrix ) ) ), size( oldMatrix ) );

should work, though I'm sure there are neater ways.

[IM]

Thanks Adam ;)!!!