how can I separate data randomly ?

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felipe gonzalez
felipe gonzalez 2015-4-29
评论： Salih Okur 2022-8-5
hi
well ... I have a dimension data matrix 445x52, I need to randomly separated into two subsets such data, training daods and test data. which basically have to do is:
dados_treinamento = Data (1: 100, :)
dados_teste = data (101: end, :)
just as the example but in a random way, how can I do this using some function of matlab?
any help is welcome

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回答（2 个）

the cyclist
the cyclist 2015-4-29
There are many ways to accomplish this in MATLAB. Here is one:
% Here are some pretend data
data = rand(445,52);
% Create a randomly ordered vector of indices, then use
% that vector to separate into two groups
idx = randperm(445);
indexToGroup1 = (idx<=100);
indexToGroup2 = (idx>100);
group1 = data(indexToGroup1,:);
group2 = data(indexToGroup2,:);
Neil Caithness
Neil Caithness 2015-4-29
Make a random permutation vector.
k = randperm(size(data,1));
then
dados_treinamento = data (k(1: 100), :)
dados_teste = data (k(101: end), :)

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