How to save results in a file without overwritting previous results????

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Javier Díez Martín 2022-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/1705395-how-to-save-results-in-a-file-without-overwritting-previous-results

评论： Walter Roberson 2022-4-28

I want to open a file and save in it specific results of a simulation but without overwritting the previous ones tha I have saved.

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Answer 1

Chunru 2022-4-27

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Use append option when you save the data to files. [You can also use low-level fopen with option 'a+' for appending]

% create a file
a1 = [1 2 3];
save('test.txt', 'a1', '-ascii');
type test.txt
   1.0000000e+00   2.0000000e+00   3.0000000e+00
%% Now save more data with append
a2 = [4 5 6];
save('test.txt', 'a2', '-ascii', '-append');
type test.txt
   1.0000000e+00   2.0000000e+00   3.0000000e+00
   4.0000000e+00   5.0000000e+00   6.0000000e+00

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Javier Díez Martín 2022-4-28

Thanks for your answer, it's very helpful. However, the programme that I am running is more complex than that, can I send you by email the whole Simulink file with the explanation of what I need?

Thanks in advance.

Walter Roberson 2022-4-28

writetable() and writematrix() support append options these days.

save() to a .mat file supports '-append'

save() to text suports '-append'

For binary files, fopen() with 'a' always appends to the end of the file (even if you have used fseek() to reposition.). fopen() with 'a+' starts at the end of the file, but permits you to fseek() and write at whatever position you are at.

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