Matlab: Improving a tree traversal code - file

Question

I have the structure that is demonstrated below:
I have a database folder which contains brands. Each brand consists of logo and query.
I want to traverse on all the the files (file_1 to file_n) in all the database and perform some operations on them.
I wrote this code:
d = dir(database);
isub = [d(:).isdir];
brandsFolders = {d(isub).name}';
brandsFolders(ismember(brandsFolders,{'.','..'})) = [];
[numberOfBrands not_used]=size(brandsFolders); %holds the number of the brands
for i=1:numberOfBrands
temp=strcat(database, '\');
currentBrand=strcat(temp, brandsFolders(i));
d = dir(currentBrand{1,1});
isub = [d(:).isdir];
logoAndQuery = {d(isub).name}';
logoAndQuery(ismember(logoAndQuery,{'.','..'})) = [];
logo=strcat(currentBrand, '\', logoAndQuery(1));
files=dir(logo{1,1});
[numberOfFiles not_used]=size(files);
for j=1:numberOfFiles
if strcmp(files(j).name, '..')~=1 && strcmp(files(j).name, '.')~=1
%operations on each files(j).name
end
end
end
The code works fine, it traverse on the desired files.
However, the code is little bit ugly and confusing.
I was wondering if I can do it in another better way?

Answer 1

Traversing through a set of directories goes pretty much as you are doing. However imo, there are some things you can do easier / I would do differently:
brandsFolders = dir(database);
brandsFolders( ~[brandsFolders.isdir] | strcmp({brandsFolders.name},'.') | strcmp({brandsFolders.name},'..')) = [];
for ii=1:numel(brandsFolders)
logoAndQuery = dir(fullfile(database,brandsFolders(ii).name));
logoAndQuery( ~[logoAndQuery.isdir] | strcmp({logoAndQuery.name},'.') | strcmp({logoAndQuery.name},'..')) = [];
logo = fullfile(databasecurrentBrand,brandsFolders(ii).name), logoAndQuery(1).name);
files = dir(logo);
files(strcmp({files.name},'.') | strcmp({files.name},'..'))=[];
for jj=1:numel(files)
%operations on each files(j).name
end
end
(This of course only works if you're sure that logoAndQuery(1) will always be the 'logo' directory.)
or alternatively use a subfunction for the dir-querying:
function dirs = getDirs(strPath)
dirs = dir(strPath);
dirnames = {dirs.name};
dirs ( ~[dirs.isdir] | strcmp(dirnames ,'.') | strcmp(dirnames ,'..')) = [];
end
which gives you already some shorter code and gives the following, in which I also assume there are no directories in the 'logo' directories:
brandsFolders = getDirs(database);
for ii=1:numel(brandsFolders)
logoAndQuery = getDirs(fullfile(database,brandsFolders(ii).name));
logo = fullfile(databasecurrentBrand,brandsFolders(ii).name), logoAndQuery(1).name);
files = dir(logo);
files([files.isdir])=[];
for jj=1:numel(files)
%operations on each files(j).name
end
end