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

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.

Answer 1

[Chunru]

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

[Javier Díez Martín]

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]

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.