MATLAB: Saving a .txt with Month/Day in filename

datefilenameformatsave

Hello MW forum!

I'd like to save a big matrix to an ascii file as double, but I'd like the date (preferably the month/day) added to the filename before the '.txt'…

I was using something like:

save('good_series.txt', matrix_variable, '-ascii', 'double')

and Ive tried a few other things where I try to pass the date in as an argument to a filename, but it was unsuccessful. I'd like to avoid using solutions with f* anything.. fid, fopen, etc.

Thank you in advance for your suggestions and help.

Sincerely,

Michael

Best Answer

Use sprintf() to construct the filename from the date string:

formatOut = 'dd-mmm-yyyy';
d=datestr(now, formatOut)
baseFileName = sprintf('%s, good_series.txt', d)
fullFileName = fullfile(yourFolder, baseFileName);
save(fullFileName, matrix_variable, '-ascii', 'double')

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It's never a good idea to modify the matlab path (with addpath or others) just to read or write data files.

The simplest way to make sure that a file is read or written in the correct folder is to simply specify the folder as part of the name when you read/write. It's easy to do: use fullfile. You've done exactly that for your dir call. Why didn't you do the same for your fopen calls.

On a completely unrelated subject, matfiles is a fairly good variable name (dircontent may be better), FileName is also a good variable name, it's easy to understand what the variables contains. B is a horrendous variable name. It's also completely pointless in your code, it's unclear why you couldn't just have done

FileName = matfiles(i).name;

and not bother with the B or even better, keep using matfiles(i).name everywhere.

So, in the end:

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for i = 1:numel(matfiles)
Data = fileread(fullfile(testfiledir, matfiles(i).name));
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fclose(FID);

While you could also use readmatrix or readtable as suggested, it may change other formatting of the file and will be slower than the above due to the parsing it does.

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try

hgsave(['SummaryPlot',num2str(ii)]);

notice the square brackets in order to concatenate 'SummaryPlot' and the output from num2str(ii). Same with

hgsave(['SummaryPlot',num2str(ii),'.txt']);

Best Answer

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