How to store some values in a txt file from a loop?

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pink flower 2020-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/514349-how-to-store-some-values-in-a-txt-file-from-a-loop

评论： pink flower 2020-4-1

file = dir ('*.dat')
for i = 1: lenght(file);
    data = fopen(file(i).name);
    soil = fread(data,[1000 1000], 'float32');
    teste = find(soil<0);
    soil(teste) = NaN;
    soil_end = soil/6;
    save (soil_end)
end

I have an .m file that opens binary data and extracts soil information from it and divides the values found by 6. I would like to store the value of each loop interaction. However, after each loop, the previous value is overwritten, is there a way I can save them all in a .txt file?

Many thanks in advance for your help!

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matquest 2020-3-31

在 MATLAB Online 中打开

You can add a couple of lines to your code to save the values:

fid = fopen('saved_data.txt', 'w'); % open the output .txt file for writing
file = dir('*.dat');
for ii = 1:length(file)
    data = fopen(file(ii).name);
    soil = fread(data, [1000 1000], 'float32');
    fprintf(fid, '%f\n', soil); % this will save the value in the soil variable to the .txt file
    ...
end
fclose(fid) % close the output .txt file

Also note that matlab uses the values i and j as imaginary numbers, so they recommend that you use something else for your index (you'll often see ii or idx used instead).

pink flower 2020-4-1