How to loop through a folder?
조회 수: 252 (최근 30일)
이전 댓글 표시
I currently have 24 folders within a folder and I was wondering if it was possible to loop through the 24 folders and extract information from a subfolder within the 24 folders.
댓글 수: 1
Brando Miranda
2018년 3월 30일
great question. This is some of the trivialest things to do in a language and its incomprehensible how hard it is to do in matlab.
답변 (3개)
Image Analyst
2014년 3월 11일
See my attached demo where it recurses through a folder and all subfolders.
댓글 수: 13
Image Analyst
2020년 12월 10일
Yes, essentially it's
filePattern = sprintf('%s/**/*.*', topLevelFolder);
allFileInfo = dir(filePattern);
See my attached m-file for a full demo with tons of explanations.
Sean de Wolski
2014년 3월 11일
편집: Sean de Wolski
2014년 3월 11일
You can use the dir command to give you the names and then loop over them.
files = dir;
directoryNames = {files([files.isdir]).name};
directoryNames = directoryNames(~ismember(directoryNames,{'.','..'}))
Now run the for-loop over directoryNames and apply your analysis to each
댓글 수: 7
Brando Miranda
2018년 3월 30일
why does
directoryNames = {files([files.isdir]).name};
work? its really cryptic? are u using list comprehensions or what dark magic is going on there?
manideep reddy
2018년 4월 18일
see my code below but make sure that the folder which we are looping through contains only flolders and not files.
cd pwd ; ## Or any other working directory you want X = ls ; disp(X) ; for itr = 1:size(X)(1) string_1 = X(itr,:) ; string_2{itr} = deblank(string_1) ; ## This deletes the trailing blank spaces end for itr = 1:size(X)(1) cd(string_2{itr}) cd ../ # DO SOMETHING # end end
댓글 수: 2
Stephen23
2018년 4월 18일
편집: Stephen23
2018년 4월 18일
This code has several bugs and could be significantly improved:
- Do NOT use cd. Using cd is slower than using absolute/relative filepaths, makes debugging more difficult, and changes which functions/scripts are accessible to MATLAB. It is NOT necessary to cd directories where datafiles are stored because all MATLAB filereading/writing functions accept relative/absolute paths. Basically cd should only be used interactively, and NOT used in code. See:
- Do NOT use ls for parsing filenames. This operator is intended for displaying a list in the command window, but parsing its output char array is a waste of time. dir is what the MATLAB documentation recommends and shows in all examples that require reading multiple files from a folder, e.g.:
- size(X)(1) is not valid MATLAB syntax, and will throw an error.
- string_2 is not preallocated.
- A loop is anyway not required for deblanking the filenames: simply use deblank(cellstr(X)).
Rather than following this buggy code, I recommend that other users follow the examples shown in the MATLAB help and wiki:
manideep reddy
2018년 4월 20일
Thank you very much. I am actually not a computer science student. So, just answered the query without considering algorithm and complexity. Anyway, I will implement your suggestions/ recommendations in future. Thanks..!
참고 항목
카테고리
Help Center 및 File Exchange에서 File Operations에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!