App Designer, expanding tree using a struct, plotting selected data, edit selected

Hello my name is markus, I´m an currently working as an intern with matlab. While writting my script I´ve stumpled upon the App Designer feature.

I think it has great potential and I would like to learn more about it. Sadly though, beeing a relatively new feature, the documentation, and tutorials are rare and most of them do not cover what I am interested in.

1. I would like to acess data from a struct that I have created in my matlab script
2. The struct should appear inside a tree, with all its subcells able to open on "childrens nobs"
3. The selected data (from the struct), voltage, current and time data should then appear in a plot when they are selected in the tree and after hitting a button
4. It would be nice to edit certain elements of the struct, which will be saved into the mat file (after hitting a button for example)

I´ve searched quite long for possible examples for such operations but I could not find any. I´m quite familiar with matlab code but the app designer style of obj based programming is very new to me. If anyone could help me solving some of those issues I would very much appreciate it.

I´m using 2018a.

Answer 1

[Markus Knoch]

I was able to also expand every node with the subsubstructs. Depending on the selected node, the corresponding data from the struct will be displayed at the plots.

            myStruct = load('data_all.mat');
            fNames1 = fieldnames(myStruct);
            for i=1:numel(fieldnames(myStruct))
               category(i)=uitreenode(app.Tree,'Text',string(fNames1(i)));
               fNames2 = fieldnames(myStruct.(string(fNames1(i))));
               
               for n=1:numel(fieldnames(myStruct.(string(fNames1(i)))))
                   uitreenode(category(i),'Text',string(fNames2(n)));
               end
            end  
                  app.myStruct =myStruct;  
                 

                function TreeSelectionChanged(app, event)
            selectedNode = app.Tree.SelectedNodes;
            
                
                x = app.myStruct.(selectedNode.Text).time;
                y1 =  app.myStruct.(selectedNode.Text).current;
                y2 =  app.myStruct.(selectedNode.Text).voltage;
                plot(app.UIAxes,x,y2);
                app.UIAxes.YLim = [0 22];
                plot(app.UIAxes2,x,y1,'r');
                app.UIAxes2.YLim = [-2 2];          

[Jose]

Thank you for posting a solution, this was very helpful!

Answer 2

[Markus Knoch]

Im currently working on it. I´ll share my progress.

            myStruct = load('data_all.mat');
            fNames = fieldnames(myStruct);
            for j=1:numel(fieldnames(myStruct))
               uitreenode(app.Tree,'Text',string(fNames(j)));
            end  

This creates the a tree with nodes named after the substruct fieldnames.

Answer 3

[apple]

Dear Markus Knoch,

I want to get the whole fields of one hdf5 data and set the data struct to app.Tree, I am not familiar with the nested struct data and the app.Tree . According to your methods, I tried but without success. Could you help me to clear this problem?

The data is from https://gamma.hdfgroup.org/ftp/pub/outgoing/NASAHDF/ATL06_20190223232535_08780212_001_01.h5

% Open the HDF5 File.

FN = 'ATL06_20190223232535_08780212_001_01.h5';

fid = H5F.open (FN, 'H5F_ACC_RDONLY', 'H5P_DEFAULT');

DataInfo = h5info(FN,'/'); % HDF5 data sturct

HDF5 data can be viewed by the following software:

https://www.giss.nasa.gov/tools/panoply/

Thank you very much!

HL