Call uitreenode as cellfun in App Designer method

Hello, i need to speed up my code which should generate a uitreenode with many entries (more than 1500). My current implementation uses a for loop and it takes to much time. The idea was to speed it up using cellfun because all entries are listet in a cell. But i was not able to set it up the right way.

Current implementation:

            for i = 1:length(channelGroup)
                
                 parent      = uitreenode(app.Tree, "Text", channelGroup(i).AcquisitionName);
                 tt          = data{i};
                nVarNames       = length(tt.Properties.VariableNames);
                nChannelGroups  = length(channelGroup);
                child           = zeros(1,nVarNames); %preallocate, better performance
                
                for j = 1:length(tt.Properties.VariableNames)
                    %wb          = waitbar((j/nVarNames),wb,['Set Up ChannelGroup ' num2str(i) '/' num2str(length(channelGroup))]);
                    child(j)    = uitreenode(parent, "Text", tt.Properties.VariableNames{j});
                 end                 
                 
            end

Using

            cellfun (@uitreenode, parent, "Text", tt.Properties.VariableNames)

does not make the job.

Can you help me set it up the right way?

[Dolon Mandal]

To speed up your code, you can try using the `arrayfun` function instead of `cellfun`. Here's an updated implementation that should help improve the performance:

for i = 1:length(channelGroup)
    parent = uitreenode(app.Tree, "Text", channelGroup(i).AcquisitionName);
    tt = data{i};
    nVarNames = length(tt.Properties.VariableNames);
    nChannelGroups = length(channelGroup);
    child = arrayfun(@(j) uitreenode(parent, "Text", tt.Properties.VariableNames{j}), 1:nVarNames);
end

In this updated code, `arrayfun` is used to create an array of `uitreenode` objects directly, avoiding the need for an inner loop. The anonymous function `@(j)` is used to iterate over the indices `1:nVarNames` and create the `uitreenode` objects with the appropriate text.

Note that the `wb` waitbar is commented out in this code snippet. If you need to include it, you can uncomment it and update the progress calculation accordingly.

I hope it helps!