Cannot create .txt file in Matlab online

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Stephanie
Stephanie 2023-9-24
评论： Star Strider 2023-9-27
I am trying to create a .txt to put some in some numbers to pull back out later.
My code is:
fileID = fopen('MyFile.txt', 'w');
When I run the code it creates a varable fileID that is shown in the workspace panel (on the lower left of the screen) as a double. But no file is created over in the files panel and when I try to read from that file it then gives an error that the file doesn't exist.

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回答（1 个）

Star Strider
Star Strider 2023-9-24
编辑：Star Strider 2023-9-25
Ran in:
I am not certain what the problem is. Using fopen only creates the file ID, as you discovewred.
To write the file, you need to do something like this —
fileID = fopen('MyFile.txt', 'w');
A = magic(5)
A = 5×5
17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9
fprintf(fileID, '%2d %2d %2d %2d %2d\n', A);
fclose(fileID);
type('MyFile.txt')
17 23 4 10 11 24 5 6 12 18 1 7 13 19 25 8 14 20 21 2 15 16 22 3 9
That should work as well on MATLAB Online.
EDIT — (25 Sep 2023 at 15:18)
Exporting it to your computer requires that you go to MATLAB Drive, check the file name, and then click on ‘Download’. (Added in EDIT.)
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Stephanie
Stephanie 2023-9-27
It wasn't creating a file though. I didn't show it here (though I realize now I should have) but I did have a couple fprintf lines to write info to the .txt fine and nothing was happening. There was no file, and even when I created 1 manually and uploaded it, it still wasn't being written to.
I literally changed nothing and pasted into the program and it worked, I got a file and stuff wrote to it. The only difference was the online platform vs the full program.
Regardless, now that I have access to the full program my problem seems to be resolved. I appreciate you giving some more explanation and trying to help.
Star Strider
Star Strider 2023-9-27
Did you try your fprintf calls with my code (using them instead of my fprintf call)?
Can you try them here? (Use the Code button ‘Insert a line of code’ to format it as code and then run the code by clicking on the green Run arrow in the top toolstrip.)
I have never had any problems with MATLAB Online (that I did not cause myself).

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