How can I generate random numbers

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Ede gerlderlands 2013-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/71990-how-can-i-generate-random-numbers

I have along data series which contains 3451 elements. From this I want to select 1/3 rd of the elements for validation purpose and the remaining for test. How can I randomly make the selection randomly? Thanks .

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Image Analyst 2013-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/71990-how-can-i-generate-random-numbers#answer_82191

编辑：Image Analyst 2013-4-14

在 MATLAB Online 中打开

Use randperm(), as this demo illustrates:

% Define the number of elements to use.
numberOfElements = 3451;
oneThird = int32(floor(numberOfElements / 3));
% Get all the indexes scrambled in a random order.
randomOrder = int32(randperm(3451));
% Select a third of them for "Validation."
indexesForValidation = randomOrder(1:oneThird);
% Select the remainder of them for "testing."
indexesForTesting = randomOrder(oneThird+1:end);