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

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R G on 27 Sep 2020
Commented: Steven Lord on 1 Oct 2020
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)

David Goodmanson on 27 Sep 2020
Edited: David Goodmanson on 27 Sep 2020
Hi RG
rng(12345) % for example
rand
rand
rng(12345)
rand % same values as before
rand
see help rand for more examples

R G on 1 Oct 2020
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 on 1 Oct 2020
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