How to shuffle data at the same way EVERYTIME random.seed(42)

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R G 2020-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/600838-how-to-shuffle-data-at-the-same-way-everytime-random-seed-42

评论： Steven Lord 2020-10-1

Hi guys,

I am looking for a way to shuffle and split my data to test 2 methods. I use 'shuffle' before using 'spliteachlabel'.

The reason I use shuffle is that I want to test many time, but shuffle will random shuffle my data without uncontronable which make the result unfair since the data is run for each method are not the same. So I wonder that there is a way to make the shuffle function run at exactly way.

I got the similar idea in Python, but dont know how to make it in Matlab

random.seed(42)
random.shuffle(imagePaths)

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Answer 1

David Goodmanson 2020-9-27

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https://ww2.mathworks.cn/matlabcentral/answers/600838-how-to-shuffle-data-at-the-same-way-everytime-random-seed-42#answer_501328

编辑：David Goodmanson 2020-9-27

在 MATLAB Online 中打开

Hi RG

rng(12345)   % for example
rand
rand
rng(12345)
rand           % same values as before
rand

see help rand for more examples

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R G 2020-10-1

编辑：R G 2020-10-1

thanks for your comment, but I think you understand wrong the idea. rand is to distribute the random number, but what I want is to shuffle the number in my array.

Steven Lord 2020-10-1

在 MATLAB Online 中打开

cards = ["A", 2:10, "J", "Q", "K"] + [" spade"; " club"; " diamond"; " heart"];
rng(12345)
order = randperm(numel(cards));
shuffledDeck1 = cards(order);
rng(12345)
order2 = randperm(numel(cards));
shuffledDeck2 = cards(order2);
isequal(shuffledDeck1, shuffledDeck2) % true