Storing data in an array from a for loop

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Yro 2020-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/510647-storing-data-in-an-array-from-a-for-loop

评论： Cris LaPierre 2020-3-13

Hi, I want to store the array (generations) obtained in each cycle for (95 arrays). With the following code I only get the arrangement corresponding to the last loop. Any ideas how to store the obtained arrays (generations) in a single array. Thanks in advance.

num_generations = 94 ;
matrices = {};
for ii = 0:num_generations
    file = sprintf('population_%d.dat', ii); 
    generations_fid = fopen(file, 'r'); 
    while ~feof(generations_fid)
        generations = cell2mat(textscan(generations_fid, repmat('%f', 1, (3)))); % array to store
        if isempty(generations)
            fgetl(generations_fid);
        else
            matrices{end+1} = generations; 
        end
    end
    fclose(generations_fid);
end

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Yro 2020-3-13

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Thanks for your reply. Yes, they have the same number of columns, 3. This is a sample.

Thanks.

generations =
   -2.7770   -4.9399  -16.7734
   -2.7770   -4.9107  -16.6909
   -2.7770   -4.8687  -16.5732
   -2.7770   -4.8534  -16.5307
   -2.6882   -4.9399  -16.4805
   -2.6806   -4.9399  -16.4221
   -2.6882   -4.9107  -16.3989
   -2.6806   -4.9107  -16.3408
   -2.6882   -4.8687  -16.2825
   -2.6882   -4.8534  -16.2404

Cris LaPierre 2020-3-13

This appears to be the data once it has been loaded into MATLAB. Could you share what the dat file looks like as well? To Mohammed's point below, I'm not sure you need all the code you have, but without knowing what your data looks like, it's hard to say.

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Answer 1

Mohammad Sami 2020-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/510647-storing-data-in-an-array-from-a-for-loop#answer_419937

编辑：Mohammad Sami 2020-3-13

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You don't need to read your file line by line. textscan can scan the entire file in one pass (unless the format spec keep changing in your file).

num_generations = 94 ;
matrices = {};
for ii = 0:num_generations
    file = sprintf('population_%d.dat', ii); 
    generations_fid = fopen(file, 'r'); 
    generations = cell2mat(textscan(generations_fid, repmat('%f', 1, 3))); % array to store
    matrices{ii+1} = generations; 
    fclose(generations_fid);
end