MATLAB: Shuffle matrix elements

shuffle matrix

Hey guys, I want to shuffle a 3×3 matrix (which consist elements within 1:9 unrepeated). So that I have written a very strange code.

>>X=perms(1:9);

Execute above line once.

Then execute below line how many shuffled matrices you want.

>>SMx=reshape(X(randi(size(X,1)),:),3,3)

Is there any better way to do this?

Best Answer

SMx = reshape(randperm(9), 3, 3);

If you have Matlab 2011b, use "randperm(9, 9)" instead: It uses the Fisher-Yates-Shuffle, which is much faster. And if you struggle with large arrays, this is even faster: FEX: Shuffle.

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One way

    A = rand(3,4)
    A( randi([1,size(A,1)],1), randi([1,size(A,2)],1) )

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Try this out:

data = [1 2 3 4 5 6 7 8 9]; % your data
rand_pos = randperm(length(data)); %array of random positions
% new array with original data randomly distributed 
for k = 1:length(data)
    data_randomly_placed(k) = data(rand_pos(k));
end

Best Answer

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