How do I save multiple variables from the workspace with a the name that the user gave them in through an input?

I am developing a program in which at a certain point the user must be able to name the file where those variables are saved prior to saving them,i.e. , the input receives the name and saves the file with that name that was given prior.

Thanks in advance!

Best regards

Answer 1

[Matt J]

As an example

      a=1;
      b=2; 
      filename='SomeVars';

      save(filename,'a','b')

[João]

Thank you! How do I change the extension of the file? In this case I need to save the file as .out.

[Matt J]

It needs to have a .mat extension for MATLAB's load() command to recognize its format, when you want to read it back in. Otherwise, it will assume that it's an ASCII file.

[João]

In what case(s) does matlab recognise a .out file then?

[Matt J]

Aside from text files, you can make binary files with fwrite(). Not very convenient for storing multiple variables, though...

[João]

Alright, thanks! Here's the deal though, I need to save the results of kruskal's algorithm (which is applied to my program) as an .out file. I've tried dlmwrite, save and uigetfile and I can't seem to make it work... Does it just not work or am I doing something wrong?

Thanks in advance!

Best Regards

[Matt J]

I don't see why dlmwrite wouldn't work, assuming your output is text. uigetfile is not for saving files, so I don't know what lead you to that. As I said before, fwrite will let you save with any filename and extension that you like.

[João]

I don't know what I was thinking when I wrote uigetfile, my bad. This is what I did with dlmwrite(generically) but it still give me an error

startingFolder = userpath

defaultFileName = fullfile(startingFolder, '*.*');

[baseFileName, folder] = uiputfile(defaultFileName, 'Specify a file');

if baseFileName == 0 % User clicked the Cancel button.

return;

end

fullFileName = fullfile(folder, baseFileName)

fid = fopen('data.out', 'at');

if fid ~= -1

    fprintf(fid, '\n'); % write newline to 'data.out'

    fclose(fid);

end

[Matt J]

Your code is hard to read. You need to use

[João]

startingFolder = userpath
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uiputfile(defaultFileName, 'Specify a file');
if baseFileName == 0

  return;
end
fullFileName = fullfile(folder, baseFileName)

fid = fopen('data.out', 'at');
if fid ~= -1
    fprintf(fid, '\n'); 
    fclose(fid);
end

[Matt J]

I don't see any call to dlmwrite in there. You also need to post the errors you received, for us to guess why they occur.