Random save two large matrices in the same manner?

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Salem 2014-11-16

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评论： Salem 2014-11-16

I have a matrix M1 and a vector M2. M1 is 4d matrix sized [150*150*3*9000] and the vector M1 is [9000*1]. Both of them saved using this command, save ('data. mat','M1','M2','-7,3'). I want to save the data randomly in both M1 & M2 but I need the rows in both M1 & M2 go together because M1 is the labeled or value of the images in M2. I tried many code, but after the change I found new rows in M2 is pointing to new rows in M1 which change the labels of the data. I tried for loop, but I've gone out of memory. So, could someone please share with me some an efficient code or way to do like this operation. Thanks in advanced.

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Guillaume 2014-11-16

What do you mean by save the data randomly. You either save a variable or you don't.

Do you mean you want to save only part of the matrices at random? Or save a random permutation of the matrix? Or something else?

Also, please don't add irrelevant tags and products. Your question has nothing to do with image processing or parallel toolbox.

Salem 2014-11-16

编辑：Salem 2014-11-16

Thanks Guillaume,

Thanks for replying. I want to save the variables in the matrix randomly. like

Sorry for adding irrelevant tags and products, I though images may is related because this matrix are images.

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Answer 1

the cyclist 2014-11-16

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编辑：the cyclist 2014-11-16

在 MATLAB Online 中打开

Here's one way. It will shuffle M1 and M2 in place:

% Smaller version of your data
M1 = rand(5,5,3,9);
M2 = rand(9,1);
% Create an random index into your matrices
idx = randperm(9);
% Shuffle both matrices by the same index, preserving the relationship
M1 = M1(:,:,:,idx);
M2 = M2(idx);