Obtaining types of files in directory and put them into an array

Question

Jason 2014-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/166118-obtaining-types-of-files-in-directory-and-put-them-into-an-array

编辑： Azzi Abdelmalek 2014-12-10

I have a range of files in a directory that I am loading into a listbox component in a GUI. In an attempt to sort firstly by extension, it has been suggested that I stack the types of files. In order to do this, I need to know what types of files exist. I am trying to get an array which just consists of all the different types of file extensions:

first i initialise the array to hold the types of files

extlist=[]; % Initialise the array

I then loop thru all files and use file parts to pull out the extension:

[folder1, name, extension] = fileparts(baseFileName);

I then attempt to add this to the array

extlist=vertcat(extlist,extension)

and this is where my attempt fails. I also do not know how to pick out single occurances so my array will just contain what types of files are present. With this list I want to then perform a stack listing procedure.

thanks for any pointers. Jason

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Answer 1

Orion 2014-12-10

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you're trying to concatenate strings of different lengths, it can't work.

put them in a cell array.

files = dir;
AllExtension = [];
for i = 3:length(files)
    [pathstr,name,ext] = fileparts(files(i).name);
    AllExtension{end+1,1} = ext;
end
AllExtension = unique(AllExtension); % get only one time the different extensions.

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Jason 2014-12-10

perfect, thankyou

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Answer 2

Azzi Abdelmalek 2014-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/166118-obtaining-types-of-files-in-directory-and-put-them-into-an-array#answer_161897

编辑：Azzi Abdelmalek 2014-12-10

在 MATLAB Online 中打开

s=dir,
f={s.name}  % The list of your files
a=regexp(f,'(?<=\.)[^\.]+$','match')
b=a(~cellfun(@isempty,a)) % list of non empty extensions
c=unique([b{:}])  % unique extension