How to save data in a file without deleting old data

Question

Mo H 2020-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/513693-how-to-save-data-in-a-file-without-deleting-old-data

回答： Ameer Hamza 2020-3-29

Hello,

I need to write a function that takes multiple inputs and then save the result in another file (let's call it savefile.M). However, I want to use the same function for another set of data and save the result in savefile.M without deleting the results obtained previously.

Thank you

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Answer 1

Ameer Hamza 2020-3-29

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https://ww2.mathworks.cn/matlabcentral/answers/513693-how-to-save-data-in-a-file-without-deleting-old-data#answer_422624

在 MATLAB Online 中打开

If it is a text file than you can open it is append mode

f = fopen('test.txt', 'a');
fprintf(f, 'This is first line.\n');
fclose(f);
f = fopen('test.txt', 'a');
fprintf(f, 'This is second line.\n');
fclose(f);