How to run a matlab code for all folders in a directory?

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Ivan Mich 2021-4-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/810710-how-to-run-a-matlab-code-for-all-folders-in-a-directory

编辑： Stephen23 2021-5-5

I have one directory with many folders. Each folder contains a .txt file (eg, file1 contain number1.txt, file2 contain number2.txt etc). these files has 4 columns with double numbers.

Also I have, outside of this directories one matlab code that reads the .txt file, makes calculations and write a file with the results.

Is there a way to run tha matlab code for all the folders with automated manner? I mean to run the code with an easy way, and not running the matlab code one by one for each folder?

回答（2 个）

Stephen23 2021-4-23

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/810710-how-to-run-a-matlab-code-for-all-folders-in-a-directory#answer_682570

编辑：Stephen23 2021-4-23

在 MATLAB Online 中打开

"Is there a way to run tha matlab code for all the folders with automated manner? "

Of course, just use DIR. For example:

P = 'absolute/relative path to the main folder';
S = dir(fullfile(P,'**','number*.txt'));
for k = 1:numel(S)
    F = fullfile(S(k).folder,S(k).name)
    yourfunction(F)
end

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Stephen23 2021-4-26

编辑：Stephen23 2021-4-26

在 MATLAB Online 中打开

As I wrote earlier, the function definition should be the first line of the file (or be preceded only by comments and/or empty lines):

filename = '*.txt';  % <- delete this line
function mycodetest(filename) % <- first line of your file

and then call your function with the required input (apparently this is the current folder name):

P = 'G:\Desktop_files\mydirectory';
S = dir(fullfile(P,'*'));
C = setdiff({S([S.isdir]).name},{'..','.'}); % subdirectory names.
for k = 1:numel(C)
    D = fullfile(P,C{k}); % this is a subdirectory of P (not a filename),
    mycodetest(D) % so you still need to handle the filenames here.
end

Note that within your function you still have not included any code that in any way handles the file names (the function input is the folder name, which you have incorrectly named "filename"). You will need to use fullfile within the function (or prior to calling the function) to add the (known, fixed) filenames to the current foldername. For the "unknown" filename you could follow the approach I gave here (or even better, use prior-knowledge about that filename to restrict the DIR search).

Ivan Mich 2021-5-2

After the corrections you mentioned command window shows me:

Error in mycodetest (line 4)

[d1,tex]= importdata(filename);

Error in Untitled (line 9)

mycodetest(D) % so you still need to handle the filenames here.

Caused by:

Error using fread

Invalid file identifier. Use fopen to generate a valid file identifier.

How can I solve it?

Stephen23 2021-5-2

编辑：Stephen23 2021-5-5

The most common cause of that error is the user supplying a filename that does not exist. The most common reasons for it not existing are 1) spelling mistakes and 2) an incorrect path.

Most likely you have not provided the complete filename (including the required absolute/relative filepath). You can check this yourself by printing the filename (or even better: using the debugging tools) of the file that you are trying to open.

Note that you will need to use FULLFILE to join the base filepath, the subdirectory name, and the filename. I suspect that you have forgotten to include the filename.

If you want further help with this then:

show the complete error message . This means all of the red text.
show the code that you are currently using.
show the complete filename that you are supplying to whatever function that imports the file data.

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