how can I separate data randomly ?

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

Answer 1

[the cyclist]

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,:);

[felipe gonzalez]

nice bro!!! tnksss :)

Answer 2

[Neil Caithness]

Make a random permutation vector.

k = randperm(size(data,1));

then

dados_treinamento = data (k(1: 100), :)
dados_teste = data (k(101: end), :)

[felipe gonzalez]

tnkss bro!!!! :)

[Salih Okur]

it works perfect. thanks alot