Run a code multiple times in different directories

Dear Matlab Users

I have 100 files which ordered by name like i_1 to i_100 and in each file I have a text file which called input.txt and a run.m file

which each time I shoud go to each directory and run this run.m which give me an output.txt by doing some changes in input.txt/ and this takes so long

My question is that how can I write a code in matlab which goes to each file and run the run.m file and save my output in that directory automatically!!!!

Thanks in advance for your help

[darova]

I think for loop will be cool

[Walter Roberson]

https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

[Sulaymon Eshkabilov]

The link provided by Walter has complete and sweet answers to the question.

[salman]

Dear All, thanks for your help,

I used this code for doing my work, but it has a problem for openning and running the .m file in the folder, any idea??

D = 'H:\Projrct\list';
S = dir(fullfile(D,'*'));
N = setdiff({S([S.isdir]).name},{'.','..'}); % list of subfolders of D.
for ii = 20:25
    T = dir(fullfile(D,N{ii},'*')); % improve by specifying the file extension.
    savename = "run";
    f = fopen([savename '.m'],'wt');
    fclose(f);
    run(savename);
end

Thanks in advance

[Stephen23]

"... and a run.m file"

Is run.m a script or a function?

https://www.mathworks.com/help/matlab/matlab_prog/scripts-and-functions.html

I suspect that the name run.m will cause you problems. You should change their names.

"I wrote this code ..."

Actually you copied one of my answers, including the comments verbatim:

https://www.mathworks.com/matlabcentral/answers/437494-how-to-loop-through-all-files-in-subfolders-in-a-main-folder#answer_354225

[salman]

run.m is just an script which use some other functions in that file for doing some analysis in .txt file

Answer 1

[Stephen23]

"but it has a problem for openning and running the .m file in the folder, any idea??"

Your code opens a text file, and then closes it immediately, without writing anything to the file:

    savename = "run";
    f = fopen([savename '.m'],'wt');
    fclose(f);

This means that run.m is totally empty (because you just discarded any content with the w option).

Then, immediately after creating a totally empty script, you run it:

    run(savename);

What do you expect running an empty script should do? I would not expect it to do anything.

Answer 2

[salman]

F=('E:\New_folder');

name=('ru.m'); % Name RUN

start=71; % Start Number

n=100; % End Number

%% Go to Address and RUN

L=string(F);

for i=start:1:n

L=string(F);

D=L+i;

cd (D);

run (name);

disp (i);

clear a b c

end

[Stephen23]

Avoid using cd in code like that.

It is not required to change directories to process data files: all MATLAB functions that read/write data files accept absolute/relative filenames.