Read files from folder and subfolder

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Turbulence Analysis 2020-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/670713-read-files-from-folder-and-subfolder

评论： Stephen23 2022-12-14

Hi all,

I intend to read multiple files in the for loop operation from the folder and subfolder, which got different file extensions. For instnace, the main folder (say Folder A) got .jpg fiels and subfolder A1 got .bmp files.

%% read files from folder A
for f = 1:1:1
    if (f>=1) && (f<=9)
        fname_strt = 'B0000' ;
    elseif (f>=10) && (f<=99)
        fname_strt='B000';
    elseif (f>=100) && (f<=999)
        fname_strt='B00';
    else
        fname_strt='B0';
    end
    fname_end = num2str(f);
    fname = strcat(fname_strt,fname_end,'.jpg');
    I=imread(fname);
G = imagesc(x,y,flipud(I));
G.AlphaData = 0.5;
hold on;
%%%%%%% read files from subfolder A1
   
    if (f>=1) && (f<=9)
        fname_strt = 'B0000' ;
    elseif (f>=10) && (f<=99)
        fname_strt='B000';
    elseif (f>=100) && (f<=999)
        fname_strt='B00';
    else
        fname_strt='B0';
    end
    fname_end = num2str(f);
    fname = strcat(fname_strt,fname_end,'.jpg');
    h=imread(fname);
H1 = imagesc(flipud(h));
H1.AlphaData = 0.5;
axis equal
hold on;
end

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Stephen23 2022-12-14

在 MATLAB Online 中打开

As an aside, you should replace all of that complex IF/ELSEIF/ELSE, NUM2STR, and STRCAT with this:

fname = sprintf('B%05d.vc7',j)

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采纳的回答

Ameer Hamza 2020-12-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/670713-read-files-from-folder-and-subfolder#answer_561153

在 MATLAB Online 中打开

You can use dir() and for-loop to iterate over files in a folder to process them. This link shows a general template: https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html. For example,

%% read files from folder A
files = dir('*.jpg');
for i = 1:numel(files)
    filepath = fullfile(files(i).folder, files(i).name);
    img = imread(filepath);
    % process the file
end
%% read files from subfolder A1
files = dir(fullfile('A1', '*.bmp'));
for i = 1:numel(files)
    filepath = fullfile(files(i).folder, files(i).name);
    img = imread(filepath);
    % process the file
end

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Ameer Hamza 2020-12-1

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This is definitely some problem with loadvec(). As the error message indicate that error occurs on line 238, which is

if isempty(filename)

which means that filename somehow become empty. And if you look at lines before 238, you can see that the function is doing some processing on the variable 'filename'. You may add a breakpoint inside the loadvec() function and see what causes the filename to become empty.

Turbulence Analysis 2020-12-1