Skipping row data repeatedly

I have a file having a sample size of 491520. I want to save every alternative 102 samples separately. For example - I want 1 to 102 but don't want 103 to 204 and so on.

Answer 1

[Akira Agata]

Like this?

% Sample data (size of 491520)
data = rand(491520,1);

idx = repelem([true;false],102);
idx = repmat(idx,ceil(491520/204),1);
idx = idx(1:size(data,1)); % Since 491520 can't be divided by 204

% Separate every alternative 102 samples
data1 = data(idx);
data2 = data(~idx);

[gopal krishan]

Thanks a lot