how to extract the names of all the files with an specific extension content in different directories and omit the name if is repeated?

If I want all the name of the files with an extension .jpg in different directories so far I use this:

dir1='~/dir1'
dir2='~/dir2'
dir3='~/dir3'

imageDirs={dir1 dir2 dir3};

fnames=dir([dir1 '/*.jpg']);
files={fnames.name}';
for i=2:length(imageDirs)
    fnames=dir([imageDirs{i} '/*.jpg']);
    newIm={fnames.name}';
    diffIm=setdiff(files,newIm);
    files=[files(:);diffIm];
    diffIm=setdiff(newIm,files);
    files=[files(:);diffIm];
end 
files=unique(files);

but I don't think that is efficient at all haha. Any suggestions I will really appreciate that

[José-Luis]

Why do you use setdiff? Do you want the unique names across all three directories?

Answer 1

[Jos (10584)]

imageDirs = {dir1 dir2 dir3} ;
for k = 1:numel(imageDirs)
   flames = dir(fullfile(imageDirs{k}, '*.jpg')) ; % fullfile for cross-OS compatibility
   newIm{k} = {fnames.name} ;
end
UniqueIm = unique([newIm{:}])