Read files from folder and subfolder

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Turbulence Analysis
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
  1 个评论
Stephen23
Stephen23 2022-12-14
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
Ameer Hamza 2020-12-1
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
  11 个评论
显示 9更早的评论
Ameer Hamza
Ameer Hamza 2020-12-1
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
Turbulence Analysis 2020-12-1
While my file is loacted in my D drive, it becomes
loadvec ('D:\New folder\A1\B00001.vc7') and this is working perfectly..
However, if i read from my server, it will be
loadvec ('\\Data\data\New folder\A1\B00001.vc7'); Here comes the error..

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