MATLAB: Save in a new file using ‘save’ command

save file

I have a program which I am applying on 50 files. I want to now save output for everytime I run the program in a new file.

Currently, I am using "save outfile er2 -ascii"

But everytime program runs it replaces outfile with the current output parameters. But I want in a new file i.e. I want a file for every run of program.

Please help me out

Best Answer

If your function is called in a loop then follow the examples here:

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

If your function is not called in a loop then you could download my FEX submission nextname:

https://www.mathworks.com/matlabcentral/fileexchange/64108-next-available-filename

and use it something like this:

D = 'absolute/relative path to the directory where the files are to be saved';
F = nextname(fullfile(D,'outfile'),'01','.mat');
save(F,'er2')

It will ensure that the filename is unique and unused each time you save the data.

I don't recommend using save for writing text files. For writing text files you should use a more appropriate function:

https://www.mathworks.com/help/matlab/text-files.html

Related Solutions

MATLAB: Save ensure automatic renaming

There is no automatic way to do that. You can write your own code for the purpose.

filenum = 0;
while true
    filenum = filenum + 1;
    filename = sprintf('myfilename_%d.mat', filenum);
    if ~exist(filename, 'file'); break; end
end
save(filename);

MATLAB: Store all iteration loop outputs in a file

If the file is very large then you could use memmapfile:

https://www.mathworks.com/help/matlab/import_export/overview-of-memory-mapping.html

Or one of the other large file accessing tools:

https://www.mathworks.com/help/matlab/large-files-and-big-data.html

Or you can simply create a new file on each iteration:

 save(sprintf('name%04d.mat',k),'X')

Note: the -append option should really be named the -replace option, as the save documentation makes clear: " save(filename,variables,'-append') adds new variables to an existing file. If a variable already exists in a MAT-file, then save overwrites it. The variables argument is optional."

Best Answer

Related Solutions

MATLAB: Save ensure automatic renaming

MATLAB: Store all iteration loop outputs in a file

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